Call for arms: full doublecheck of TRP
We have recently started a limited doublecheck effort for The Riesel Problem and this has very quickly yielded a prime, which means that the results that we obtained from Riesel Sieve project cannot be trusted 100%. Therefore we have decided to run a full doublecheck effort.
We would like to quickly go through the doublecheck ranges and resume our original search, so we would like to ask you to consider redirecting any resources you may have available to The Riesel Problem (TRP) subproject. You can do that by visiting project preferences page.
Applications are available for Windows, Linux and Mac. 32bit applications will be sent to 64bit hosts.
3 Feb 2012 | 12:22:23 UTC
· Comment
Prime found for the Riesel Problem
On 2 Feb 2012, 21:30:55 UTC, PrimeGrid’s The Riesel Problem project eliminated k=162941 by finding the prime: 162941*2^993718-1
The prime is 299,145 digits long and will enter Chris Caldwell's The Largest Known Primes Database ranked 1536th overall. This prime was found while exploring a suspected gap in a previously searched range. This is PrimeGrid's 8th elimination. 56 k's now remain.
The discovery was made by Dmitry Domanov (unconnected) of Russia using an Intel Xeon @ 3.60GHz with 2 GB RAM running Windows Server 2003 Enterprise x86. This computer took just over 1 hour 5 minutes to complete the primality test using LLR. Dmitry is a member of Team Russia.
For more details, please see the official announcement.
3 Feb 2012 | 5:02:47 UTC
· Comment
The Tour de Primes Begins!
Come join us in laid-back competition in tribute to the number 2...the first prime and the only even prime. The prizes are simple colored jerseys . Yellow for the most primes, Green for the highest prime score, and Polk-a-dot for the most primes on 19 Feb. No pressure or stress other than what you put on yourself. :) For more information, please see Tour de Primes 2012.
1 Feb 2012 | 0:29:32 UTC
· Comment
World Record Generalized Cullen Prime
On 29 Jan 2012, 08:10:03 UTC, PrimeGrid’s PRPNet found the largest known generalized Cullen prime: 427194*113^427194+1
The prime is 877,069 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 1st for generalized Cullen primes and 57th overall.
The discovery was made by Ricky L. Hubbard of the United States using an AMD Phenom II X6 1090t @ 3.2GHz with 8GB RAM, running Windows 7. This computer took 7 hours and 15 minutes to complete the probable prime test using pfgw64 and 7 hours 20 minutes to complete the primality test again using pfgw64. Ricky is a member of the AMD Users Team.
For more details, please see the official announcement.
30 Jan 2012 | 2:12:11 UTC
· Comment
Tour de Primes 2012
February is just a week away which means it is time for the 4th annual Tour de Primes. 2 is the first prime number...and the only even one. Therefore, we have declared February, the 2nd month, as prime month.
We're offering a small informal competition in tribute to this unique prime number. There are no points to be gained or awards to be won...just a simple rare jersey (Yellow, Green, and Polk-a-dot) at the end of the month to add to your badge collection. No pressure or stress other than what you put on yourself. :) For more information, please see Tour de Primes 2012.
24 Jan 2012 | 16:23:12 UTC
· Comment
The Year of the Dragon in 24 hours
The Dragon, the mightiest of all the signs, is a creature of myth and legend. In Asia, the Dragon is an auspicious creature, a symbol of benevolent power, strength and good luck and capable of great good. 23 January 2012 marks the start of the Year of the Dragon. Let's see if we can channel that Dragon energy to find some primes for the start of PrimeGrid's 2012 Challenge Series.
A 5 day Challenge is being offered on PrimeGrid's Proth Prime Search (LLR) application. For more information, please see this forum thread.
22 Jan 2012 | 15:22:23 UTC
· Comment
Generalized Fermat Mega Prime
On 18 Jan 2012 21:13:24 UTC, PrimeGrid’s Generalized Fermat Prime Search found the mega prime: 525094^262144+1
The prime is 1,499,526 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 2nd for Generalized Fermat Primes and 24th overall.
The discovery was made by David Tomecko of the United States using an NVIDIA GeForce GTX 570 in an Intel Core i7 980 @ 3.33GHz system with 24GB RAM, running Windows 7 Ultimate. This GPU took about 55 minutes 24 seconds to probable prime (PRP) test with GenefCUDA. David is a member of the The Knights Who Say Ni! team.
The PRP was verified on 19 Jan 2012 7:37:53 UTC, by Rick Reynolds of the United States. For more details, please see the official announcement.
22 Jan 2012 | 3:48:31 UTC
· Comment
Mega Prime Found
On 17 Jan 2012 20:24:07 UTC, PrimeGrid’s Mega Prime Search, through PRPNet, found the Mega Prime: 81*2^3352924+1
The prime is 1,009,333 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 42nd overall. This prime is also a Generalized Fermat prime and ranks as the 6th largest found.
The discovery was made by Michał Gasewicz of Poland using an Intel dual Xeon E5520 @ 2.27GHz with 12GB RAM, running 64 bit Linux. This computer took just over 4 hours 28 minutes to complete the primality test using LLR. Michał is a member of the BOINC@Poland team.
For more details, please see the official announcement.
18 Jan 2012 | 15:35:16 UTC
· Comment
AVX build of llr
Gary Craig, a member of Aggie The Pew, was successful in compiling an AVX version of LLR using gwnum v27.2 and LLR v3.8.6dev. We've been testing it for the past week with success. Depending on the LLR project, speed improvements range from 20% to 50%.
For more details, please see this post
9 Jan 2012 | 6:35:17 UTC
· Comment
Prime Fermat Divisor Found
Congratulations to Bruce Dodson (bdodson*) of the United States, the discoverer of PrimeGrid's 9th Prime Fermat Divisor in the Proth Prime Search project: 329*2^1246017+1 Divides F(1246013). This is the 293rd known divisor and the 1st found in 2012. Bruce is a member of the Sicituradastra. team.
For more details, please see the official announcement.
6 Jan 2012 | 22:46:22 UTC
· Comment
Welcome to 2012
The New Year is here and so to are a couple of new projects at PrimeGrid. The Wieferich and Wall-Sun-Sun prime searches are now available through PrimeGrid's PSA PRPNet. Already in beta testing, a new "near" Wieferich prime (|A| < = 100) has been found. [correction - the "near" Wieferich prime was already known]
This first week of 2012 is planned as a home warming party. Please stop by, crunch a few WU's and read up more about these extremely rare and unique primes. For more information, please see A week of Wieferich and Wall-Sun-Sun.
1 Jan 2012 | 0:07:41 UTC
· Comment
2011 Challenge Series Final Rankings
PrimeGrid's 2011 Challenge Series is final. Another incredible year of growth and competition...so much so that the servers were stressed again on a few Challenges. A tremendous about of work was accomplished leading to some pretty special primes found this year.
Congratulations to Sicituradastra. as the top team and Snf* as the top individual. They are the winners of PrimeGrid's 2011 Challenge Series. For complete, extended rankings please see: Individuals | Teams
As always, thank you for your help and support. We continue to be humbled by your participation. None of this is possible without YOU! :) Have a safe and happy Holiday season. See you next year for PrimeGrid's 2012 Challenge Series!
31 Dec 2011 | 3:59:08 UTC
· Comment
World Record Twin Primes
On 25 Dec 2011 13:31:28 UTC, PrimeGrid's Sophie Germain Prime Search found World Record Twin Primes: 3756801695685*2^666669±1
The twin primes are 200,700 digits long, eclipsing the previous record of 100,355 digits. They will enter Chris Caldwell's The Largest Known Primes Database ranked 1st for twins. This is PrimeGrid's third record twin.
The discovery was made by Timothy D. Winslow of the United States using an Intel Core i7 920 @ 2.67GHz with 8 GB RAM running Windows 7 Ultimate. This computer, using LLR, took 9 minutes and 21 seconds to complete the primality tests of both primes. Timothy is a member of The Knights Who Say Ni! team.
The prime was verified on 26 Dec 2011 1:58:19 UTC, by Brage E. Elliott of the United States. For more details, please see the official announcement.
26 Dec 2011 | 6:53:27 UTC
· Comment
World Record Twin Primes Found!
It appears that one lucky cruncher has received a very nice Christmas gift. Twin primes have been returned to the server and verified. They were found in the Sophie Germain Prime Search and are almost twice the size of the current record. This is an incredible accomplishment!
We are awaiting contact from the appropriate users. Stay tuned for more details. :)
26 Dec 2011 | 5:21:24 UTC
· Comment
The Winter Solstice Challenge - Final
The Winter Solstice is here!!! The yule log, filled with factors, is making for a very bright night. This has been a very successful Challenge not only for PrimeGrid but also for the entire Riesel prime search community (benefactors of the k*2^n-1 that's also sieved). Once again, a new single day record was set during the final Challenge of the year. A hearty thanks and a warm appreciation for all those involved.
Over 2.86P of sieve work was crunched in ~318K tasks resulting in just over 1B cobblestones awarded. This is again a continuing legacy for Ken Brazier's tpsieve* port to the GPU. (*originally developed by Geoff Reynolds in collaboration with Ken Brazier)
Congratulations to Sicituradastra. as the top team and STE\/E as the top individual. For more stats and information, please see this forum post.
This concludes PrimeGrid's 2011 Challenge Series. Overall final results will be posted in a couple of days. Thank you to everyone who participated this year. We wish you a Happy Holidays and hope to see you next year!
22 Dec 2011 | 6:15:18 UTC
· Comment
The Winter Solstice Challenge - 12 hrs remaining
The Solstice is soon upon us. Bundle up tight as it's going to be a long Winter's night. 12 hours remain in the Challenge. Time to round up all those factors, combine them into one HUGE yule log, and toss it into the fire.
The Winter Solstice arrives at 05:30 UTC 22 December 2011. Get your factors in by then. :)
21 Dec 2011 | 17:31:31 UTC
· Comment
The Winter Solstice Challenge in 24 hours
The Solstice draws near and so does the start of the Winter Festival. Come one, come all and warm yourselves by the Solstice fires. PrimeGrid's 2011 Challenge series ends with a 3 day (19-22 Dec) Challenge on the PPS (Sieve) application.
For more information, please see this forum thread.
18 Dec 2011 | 5:27:19 UTC
· Comment
The Winter Solstice Challenge in 3 days
The Solstice fires are currently being constructed. Foraging through the DB, we're gathering all the "cast off" factors and adding them to the stack. Come join the winter festival on the 19th as we celebrate the upcoming Solstice. Find your own factors and toss them into the fire.
A 3 day (19-22 Dec) Challenge is being offered on the PPS (Sieve) application. For more information, please see this forum thread.
16 Dec 2011 | 17:04:10 UTC
· Comment
The Winter Solstice Challenge in 6 days
For those of us in the Northern Hemisphere, the full force of Winter is soon here. Please come join us in observing one of Nature's way-points...the Winter Solstice. A 3 day (19-22 Dec) Winter Festival/Challenge is being offered on the PPS (Sieve) application. 32 & 64 bit builds are available for Mac, Linux, and Windows as well as CUDA/ATI (OpenCL) for the GPU.
This will conclude PrimeGrid's 2011 Challenge series. For more information, please see this forum thread.
13 Dec 2011 | 1:22:12 UTC
· Comment
GFN Prime Search Sieving
It has been a lukewarm response to the re-start of GFN sieving. This sieve will support 3 new N's in the GFN prime search (1048576, 2097152, 4194304). If you have Windows 64 bit and would like to put it to good use in a specialized sieve (one of which might eventually produce the world's largest prime), then please review these instructions.
This manual sieve is located in the Project Staging Area. It's a simple and straight forward process. For more details, please see this post.
7 Dec 2011 | 3:50:11 UTC
· Comment
The March to the Solstice
Come join the March to the Solstice (24 Nov - 19 Dec). We'll be pushing PPS (LLR) as far along as possible before the final Challenge of the year, the Winter Solstice Challenge (19 Dec - 22 Dec). We have established intermediate goals for PPS (LLR) and are within striking distance of completing them by the end of year 2011.
This by no means is a "walk in the park". :) It will take a concentrated and sustained effort to reach these goals. For more details, please see this post.
28 Nov 2011 | 4:08:20 UTC
· Comment
World Record Generalized Fermat Prime
On 19 Nov 2011 14:03:58, PrimeGrid's PRPNet found the largest known Generalized Fermat mega prime: 75898^524288+1
The prime is 2,558,647 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 1st for Generalized Fermat Primes and 13th overall. This is the first prime found at N=524288.
The discovery was made by Michael Goetz of the United States using an NVIDIA GeForce GTX 460 in an Intel Core2 Q6600 @ 2.4GHz system with 8GB RAM, running 64 bit Windows 7. The GPU took just under 5 hours to probable prime (PRP) test with GeneferCUDA. The CPU completed the primality test using pfgw64 in a little over 8 days! Michael is a member of the SETI.USA team.
For more details, please see the official announcement.
19 Nov 2011 | 21:41:43 UTC
· Comment
The Leonids Challenge in 24 hours
Come see if you can catch a "falling star" in the Leonids meteor shower Challenge. A 5 day Challenge is being offered on the 321 Prime Search (LLR) project. For more information, please see this forum post.
17 Nov 2011 | 18:45:14 UTC
· Comment
The Leonids Challenge in 3 days
In 3 days, the Leonids Challenge will begin. Come watch the "falling stars" and see if you can snag a 321 Mega Prime. A 5 day (18-23 November) Challenge is being offered on the 321 Prime Search (LLR) application. For more information, please see this forum post.
15 Nov 2011 | 21:01:50 UTC
· Comment
The Leonids Challenge in 5 days
In 5 days, the Leonids Challenge will begin. Come watch the "falling stars" and hopefully find a rare 321 prime. A 5 day (18-23 November) Challenge is being offered on 321 Prime Search (LLR) application. For more information, please see this forum post.
13 Nov 2011 | 6:57:45 UTC
· Comment
LLR v3.8.6 released
After experiencing some erratic behavior from several new hosts, specifically the AMD FX(tm)-8120 Eight-Core Processor, we have updated LLR from v3.8.4 to v3.8.6. This latest version uses GWNUM v26.6, and it appears to have solved the problem.
We expect high bandwidth usage over the next several hours as LLR v3.8.6 is downloaded for Linux, Windows, and Mac OS's.
11 Nov 2011 | 19:19:58 UTC
· Comment
World Record Generalized Fermat Prime
On 29 Oct 2011 11:31:47 UTC, PrimeGrid’s PRPNet found the largest known Generalized Fermat Prime: 361658^262144+1
The mega prime is 1,457,075 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 1st for Generalized Fermat Primes and 24th overall.
The discovery was made by Michel Johnson of Germany using an NVIDIA GeForce GTX 550 Ti in an AMD PHENOM II X6 1100T @ 3.3GHz system with 4GB RAM, running 32 bit Windows XP. This GPU took about 1 hour and 45 minutes to probable prime (PRP) test with GenefCUDA. (NOTE: This is the first prime found by geneferCUDA!) Michel is a member of the SETI.Germany team.
The prime was confirmed in 50 hours and 40 minutes using pfgw64 on an Intel Xeon 5410 @ 2.33GHz with 16GB RAM, running Windows Server 2003 x64.
For more details, please see the official announcement.
6 Nov 2011 | 13:55:55 UTC
· Comment
SGS single primes reaching the end of the Top 5000 list
The single primes as a byproduct from the Sophie Germain Prime Search are reaching the end of their stay in the Top 5000 list. There's roughly 10-14 days left until they will no longer enter the list. This does not affect the overall search as the goal remains to find a Sophie Germain prime and/or a twin prime.
If you're still looking for your first reportable SGS single prime, now's the time to get it. The elusive Sophie Germain and twin primes are still at large so there remains a chance at finding one of them as well. :)
To run this project, simply select "Sophie Germain Prime Search (LLR)" on your PrimeGrid preferences page.
20 Oct 2011 | 15:14:03 UTC
· Comment
October's PRPNet Project
The dual Sierpinski problem (Five or Bust) is PrimeGrid's PRPNet project of the month for October. The goal will be to complete the double check effort before the end of the month.
The project will run from 1 October to 31 October (hopefully it will end sooner). It will be a great opportunity to be part of worthy cause in closing out the dual Sierpinski problem. Feel free to stop by after the Equinox Challenge is complete. For more information, please see this forum post.
1 Oct 2011 | 3:19:00 UTC
· Comment
The Equinox Challenge Update
Just over a week into the 13 day Equinox Challenge and the competition is heating up. A lot of back and forth going on by both teams and individuals in some very tight races. It's not too late to get another couple of WU's completed before the end (06 Oct 2011 18:00 UTC). Sadly, no luck with finding a Woodall prime yet.
For more information on joining the Challenge, please see this forum post.
1 Oct 2011 | 3:04:36 UTC
· Comment
The Equinox Challenge in 22 hours
A 13 day Challenge marathon on the Woodall Prime Search project approaches in just 22 hours. This Challenge is PrimeGrid's longest of the year and the Challenge points the highest. Come join us on the autumnal equinox, 23 Sep 2011 18:00 UTC, and see how many tasks you can return by 06 Oct 2011 18:00 UTC.
For more information, please see this forum post.
22 Sep 2011 | 20:05:40 UTC
· Comment
The Equinox Challenge in 5 days
PrimeGrid's Challenge series continues with the "Equinox Challenge". Come join us as we usher in the fall and cooler temperatures with a 13 day marathon on the Woodall Prime Search project. The challenge will begin on the autumnal equinox, 23 Sep 2011 18:00 UTC, and end 06 Oct 2011 18:00 UTC.
For more information, please see this forum post.
19 Sep 2011 | 2:46:24 UTC
· Comment
Prime Fermat Divisor found
Congratulations to Grzegorz Granowski (Grzegorz Granowski) of Poland, the discoverer of PrimeGrid's 8th Prime Fermat Divisor in the Proth Prime Search project: 25*2^2141884+1 Divides F(2141872). This is the 292nd known divisor and the 9th found in 2011. Grzegorz is a member of the Polish National Team.
For more details, please see the official announcement.
12 Sep 2011 | 14:27:01 UTC
· Comment
PRPnet issues
Because of a router failure some PRPnet servers for Project Staging Area are not accessible. None of the BOINC services are affected and all are running fine.
We are trying to work around the problem by routing network requests around because the hardware isn't accessible at the moment and can't be rebooted and/or replaced. Because of this you may see some connection errors in the nearest future.
Update 19:10: PRPnet requests are now being routed around the failed router. PRPnet IP address has changed, so it will take time for DNS to synchronize - if you still can't connect, please give it some more time.
24 Aug 2011 | 17:43:16 UTC
· Comment
The Dog Days of Summer Challenge
The Dog Days are here! In just 6 days, PrimeGrid's Challenge series continues with the Dog Days of Summer Challenge (26-28 August). Please come join us for a 2 day Challenge on PrimeGrid's Proth Prime Search (LLR) application. Builds are available for Linux, Mac and Windows.
For more information, please see this forum thread.
20 Aug 2011 | 22:41:50 UTC
· Comment
Prime Fermat Divisor found
Congratulations to Peter Doggart (Hammeh) of the United Kingdom, the discoverer of PrimeGrid's 7th Prime Fermat Divisor in the Proth Prime Search project: 4479*2^226618+1 Divides F(226614). This is the 291st known divisor and the 8th found in 2011. Peter is a member of PrimeSearchTeam.
For more details, please see the official announcement.
10 Jul 2011 | 4:59:18 UTC
· Comment
Prime Fermat Divisor found
Congratulations to Mark Doom (Mark Doom) of the United States, the discoverer of PrimeGrid's sixth Prime Fermat Divisor in the Proth Prime Search project: 3771*2^221676+1 Divides F(221670). This is the 289th known divisor and the 6th found in 2011. Mark is a member of team Aggie The Pew.
For more details, please see the official announcement.
2 Jul 2011 | 16:09:28 UTC
· Comment
Prime Fermat Divisor found
Congratulations to Dirk D'huyvetters (Dirk) of Belgium, the discoverer of PrimeGrid's fifth Prime Fermat Divisor in the Proth Prime Search project: 7333*2^138560+1 Divides F(138557). This is the 288th known divisor and the 5th found in 2011.
For more details, please see the official announcement.
23 Jun 2011 | 19:26:17 UTC
· Comment
World Record Prime Fermat Divisor
Congratulations to Scott Brown (Scott Brown) of the United States, the discoverer of a World Record Prime Fermat Divisor: 9*2^2543551+1 Divides F(2543548).
The prime is 765,687 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 1st for Prime Fermat Divisors and 57th overall.
This is PrimeGrid's 1st found prime Fermat divisor since 2009 and 4th overall. This is the 287th known divisor and the 4th found in 2011.
For more details, please see the official announcement.
23 Jun 2011 | 3:09:01 UTC
· Comment
PrimeGrid's Birthday/Summer Solstice Challenge - Final
The Summer Solstice has arrived in the Northern Hemisphere. We hope everyone enjoys this longest day of the year...and for you Southern Hemisphere folks, we hope you kept warm. :)
The Cullen/Woodall (Sieve) reached an incomplete depth of over 566T. Over 30T of sieve work was crunched in 251K tasks resulting in over 91.5M cobblestones awarded.
Congratulations to Sicituradastra. as the top team and Ross* as the top individual. For more stats and information, please see this forum post.
Thank you again to everyone. We appreciate your participation and hope you had fun! Have a wonderful summer and we look forward to seeing you in a couple months at the next Challenge - The Dog Days of Summer Challenge - 26-28 August - 48 hours on the PPS (LLR) application! Come take a break from the Dog Days and cool off with a few primes. It's a GREAT opportunity for you to find a Top 5000 Prime. :)
21 Jun 2011 | 17:57:11 UTC
· Comment
PrimeGrid's Birthday/Summer Solstice Challenge in 2 days
PrimeGrid's Challenge series continues with the "Birthday/Summer Solstice Challenge". Come join us as we celebrate PrimeGrid's 6th birthday. A 24 hour Challenge is being offered on the Cullen/Woodall (Sieve) application. The celebration will culminate in the ancient observation of the Summer Solstice, 21 June!
For more information, please see this forum post.
18 Jun 2011 | 1:08:46 UTC
· Comment
World Record Factorial Prime
On 11 June 2011, PrimeGrid’s PRPNet found the largest known Factorial prime: 110059!+1
The prime is 507,082 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 1st for Factorial primes and 130th overall.
The discovery was made by Peter Doggart (Hammeh) of the United Kingdom using an AMD Phenom 9600 X4 @ 2.3GHz with 3GB RAM, running 32 bit Windows 7. This computer took just under 57 hours and 46 minutes to complete the primality test using pfgw. Peter is a member of the PrimeSearchTeam.
For more details, please see the official announcement.
13 Jun 2011 | 3:03:18 UTC
· Comment
Mega Prime found for The Riesel Problem (Déjà vu Déjà vu)
On 31 May 2011 20:08:26 UTC, PrimeGrid’s The Riesel Problem project eliminated k=353159 by finding the mega prime: 353159*2^4331116-1
The prime is 1,303,802 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 25th overall. This is the largest prime found in The Riesel Problem and PrimeGrid's 7th elimination. 57 k's now remain.
The discovery was made by Jaakko Reinman (sqweeser) of Finland using an Intel Core2 Quad Q9550 @ 2.83GHz with 4 GB RAM running Linux. This computer took just over 8 hours and 9 minutes to complete the primality test using LLR. Jaakko is a member of the BOINC@Finland team.
The prime was verified on 1 Jun 2011 4:05:40 UTC, by Grzegorz Granowski (Grzegorz Granowski) of Poland. For more details, please see the official announcement.
1 Jun 2011 | 13:16:25 UTC
· Comment
Mega Prime found for The Riesel Problem
On 26 May 2011 11:08:52 UTC, PrimeGrid’s The Riesel Problem project eliminated k=141941 by finding the mega prime: 141941*2^4299438-1
The prime is 1,294,265 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 25th overall. This is the largest prime found in The Riesel Problem and PrimeGrid's sixth elimination. 58 k's now remain.
The discovery was made by Scott Brown (Scott Brown) of the United States using an Intel Core2 Duo E8400 @ 3.0GHz with 4 GB RAM running Windows 7. This computer took just over 7 hours and 25 minutes to complete the primality test using LLR. Scott is a member of the Duke University team.
The prime was verified on 28 May 2011 23:08:20 UTC, by Piotr M. Zalewski (Piotr M. Zalewski) of Poland. For more details, please see the official announcement.
29 May 2011 | 14:18:09 UTC
· Comment
Mega Prime found for The Riesel Problem (Déjà vu)
Remarkably, another mega prime has been found during the Cinco de Mayo Challenge.
On 8 May 2011 15:43:27 UTC, PrimeGrid’s The Riesel Problem project eliminated k=415267 by finding the mega prime: 415267*2^3771929-1
The prime is 1,135,470 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 29th overall. This is the 2nd largest prime found in The Riesel Problem and PrimeGrid's fifth elimination. 59 k's now remain.
The discovery was made by Alexey Tarasov (Alexus78) of the Ukraine using an Intel Core2 Duo E6550 @ 2.33GHz with 1 GB RAM running Windows XP Professional. This computer took just over 10 hours and 18 minutes to complete the primality test using LLR. Alexey is a member of the Ukraine team.
The prime was verified on 13 May 2011 15:36:23 UTC, by Brett Melvold (AgentQ) of Australia. For more details, please see the official announcement.
13 May 2011 | 23:47:46 UTC
· Comment
Mega Prime found for The Riesel Problem
On 8 May 2011 7:29:52 UTC, PrimeGrid’s The Riesel Problem project eliminated k=123547 by finding the Mega prime: 123547*2^3804809-1
The prime is 1,145,367 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 28th overall. This is the largest prime found in The Riesel Problem and PrimeGrid's fourth elimination. 60 k's now remain.
The discovery was made by Jakub Łuszczek (..:: Thor ::..) of Poland using an Intel Core i5 2500 @ 3.3GHz with 8 GB RAM running Windows 7 Home Premium x64. This computer took just over 4 hours and 35 minutes to complete the primality test using LLR. Jakub is a member of the Polish National Team.
The prime was verified on 11 May 2011 19:41:48 UTC, by Frans Englund (Snf*) of Sweden. For more details, please see the official announcement.
11 May 2011 | 22:52:38 UTC
· Comment
The Cinco de Mayo Challenge in less than 3*2^3 hours
Come join us for the 5th day of the 5th month celebration. A 2^3 day Challenge is being offered on PrimeGrid's "The Riesel Problem" (LLR) application…ends on the 13th. There remains 61 k's in The Riesel Problem for which no primes have been found.
For more information, please see this forum post.
4 May 2011 | 19:40:01 UTC
· Comment
BOINC Pentathlon
SETI.Germany is hosting the 2nd annual BOINC Pentathlon where all BOINC-Teams are invited to participate. This year, PrimeGrid has been chosen as the second of five disciplines. The Pentathlon will focus on PrimeGrid's GPU projects from 8 May 2011 to 13 May 2011.
For more information on this special event and to see the other projects selected, please visit BOINC Pentathlon Welcome page.
2 May 2011 | 14:46:04 UTC
· Comment
The Cinco de Mayo Challenge in 3^2 days
In 3^2 days, come join us for the 5th day of the 5th month celebration. A 2^3 day Challenge is being offered on PrimeGrid's "The Riesel Problem" (LLR) application…ends on the 13th. That's a lot of prime numbers in the first 2 sentences. :) Let's continue the trend and find some primes during the Challenge. There remains 61 k's in The Riesel Problem for which no primes have been found.
For more information, please see this forum post.
26 Apr 2011 | 5:05:48 UTC
· Comment
April's PRPNet Project - 5oB home stretch
Two thirds of the way through the month and we're in the home stretch. The 5oB double check is turning out to be like a good old fashioned tractor pull. The closer we get to the finish, the harder the task becomes. Now more that ever we need additional help to help stave off the decline in our daily rate…which has seen seven straight days of decline.
The higher numbers are starting to get the better of us and the naysayers are beginning to weigh down the sled. Let's throw some extra power on this and knock the naysayers off. :)
Please keep spreading the word. We still need more support to reach the goals. For more information, see this forum post.
20 Apr 2011 | 1:16:30 UTC
· Comment
Subproject completion - 321 Prime Search (Sieve)
321 Prime Search (Sieve) subproject has reached the "optimal zone" and will be suspended on 22 April 2011. This means that no more work for 321 Prime Search (Sieve) will be added after 22nd, but outstanding work will be allowed to complete. 321 Prime Search (LLR) will not be affected and will continue running.
Once the work is depleted, project preferences will be automatically changed for people who have selected only 321 Prime Search in their preferences. Default subprojects will be selected, but you may wish to proactively choose a subproject or two.
For people fighting for a badge this may be a good opportunity to push if you are lacking just a few credits.
17 Apr 2011 | 8:38:49 UTC
· Comment
April's PRPNet Project - 5oB
Half way through the month and steady progress continues. We are certainly making the naysayers sweat a little. The first goal is definitely within reach. A HUGE thanks to everyone who has answered the call for help. Let's keep the pressure up!!!
Please keep spreading the word. We still need more support to reach the other two goals...tell a teammate or two or three. :) For more information, see this forum post.
15 Apr 2011 | 21:37:28 UTC
· Comment
Mega Prime found for The Riesel Problem
On 5 Apr 2011 7:13:12 UTC, PrimeGrid’s The Riesel Problem project eliminated k=65531 by finding the Mega prime: 65531*2^3629342-1
The prime is 1,092,546 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 29th overall. This is the largest prime found in The Riesel Problem and PrimeGrid's third elimination. 61 k's now remain.
The discovery was made by Adrian Schori of Switzerland using an Intel Core i5 750 @ 2.67GHz with 4 GB RAM running Mac OS X. This computer took just over 5 hours and 12 minutes to complete the primality test using LLR. Adrian is a member of SwissTeam.NET.
For more details, please see the official announcement.
12 Apr 2011 | 2:54:24 UTC
· Comment
April's PRPNet Project - 5oB
A third of the way through the month and our effort to help out the successful "Five or Bust" project is making steady progress.
If you are in search for your PSA badge (or upgrade the one you have), now is a good opportunity to get that done as well as give to a worthy cause. :) PSA credit is available. If you are new to PRPNet, individualized "pre-set" packages can be made where all you'll have to do is download, double click a couple of times and be quickly contributing to the project.
We have updated goals for the month. Please see if you can help us reach them. For more information, see this forum post.
10 Apr 2011 | 2:52:21 UTC
· Comment
The Marie-Sophie Germain Challenge - Final
After a relatively quick "clean-up", the results are final. What an excellent turnout for the Challenge. Over 120 single primes were returned during the Challenge. Unfortunately, no luck with finding a Sophie Germain or twin prime.
Over 1.3M tasks were completed resulting in over 11.3M Challenge points awarded. Congratulations to Ukraine as the top team and Alexus78 as the top individual. For more stats and information, please see this forum post.
Thank you again to everyone. We appreciate your participation and hope to see you at the Cinco de Mayo Challenge. Come join us 5-13 May for an 8 day celebration on The Riesel Problem (LLR) application! Currently, there are 61 k's remaining that need to be eliminated.
9 Apr 2011 | 14:16:07 UTC
· Comment
The Marie-Sophie Germain Challenge in 3 hours
Come join us as we pay tribute to Marie-Sophie Germain with a 2 day (1-3 April) Challenge on the Sophie Germain Prime Search project.
For more information, please see this forum post.
1 Apr 2011 | 15:00:22 UTC
· Comment
The Marie-Sophie Germain Challenge in 2 days
Marie-Sophie Germain was born on April 1, 1776, in Paris, France. She was an extraordinary "French mathematician who made important contributions to the fields of differential geometry and number theory and to the study of Fermat's Last Theorem." (Wiki) Come join us as we pay tribute to her with a 2 day (1-3 April) Challenge on the Sophie Germain Prime Search project.
For more information, please see this forum post.
30 Mar 2011 | 17:35:27 UTC
· Comment
Planned maintenance on Monday
We are planning a short downtime on Monday to install additional hardware and reorganize network in the server rack. You may wish to increase work cache slightly if you are running with a very low cache size.
[update 15:25UTC] Maintenance has been completed successfully.
12 Mar 2011 | 13:54:05 UTC
· Comment
Generalized Fermat Mega Prime
On 08 Mar 2011 10:35:34 UTC, PrimeGrid's PRPNet found a Generalized Fermat mega prime: 40734^262144+1
The prime is 1,208,473 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 2nd for Generalized Fermat Primes and 26th overall.
The discovery was made by Senji Yamashita of Japan using an Intel Core 2 Quad Q9450 @ 2.66GHz with 2GB RAM, running Windows 7 Professional 64bit. This computer took 4 hours and 29 minutes to complete the primality test using pfgw64. Senji is a member of the PrimeSearchTeam.
For more details, please see the official announcement.
9 Mar 2011 | 21:21:03 UTC
· Comment
World Record 321 Prime
On 21 Feb 2011 21:45:32 UTC, PrimeGrid’s 321 Prime Search found another Mega Prime: 3*2^7033641+1
The prime is 2,117,338 digits long and will enter Chris Caldwell's The Largest Known Primes Database ranked 14th overall. This is the second mega prime and the largest for the 3*2^n+1 form. It is also the second largest found mega prime using LLR and PrimeGrid's 10th overall mega prime.
The discovery was made by Michael Herder using an Intel Core i7 920 @ 2.67GHz with 6 GB RAM running Windows 7 Ultimate x64. This computer took just over 17 hours and 24 minutes to complete the primality test using LLR. Michael is a member of the BOINCstats team.
For more details, please see the official announcement.
1 Mar 2011 | 4:03:32 UTC
· Comment
World Maths Day Challenge in 15 hours
The World Maths Day games are in full swing. Head over there to test your math skills. But don't forget to check back here in less than 15 hours. A 24 hour Challenge is being offered on PrimeGrid's The Riesel Problem (Sieve).
For more information, please see this forum post.
1 Mar 2011 | 3:48:14 UTC
· Comment
World Maths Day Challenge in 3 days
Time to dust off the cobwebs and start recalling all your math knowledge. PrimeGrid's 2011 Challenge series continues with the "World Maths Day Challenge". Come join the competition here as well as at the World Maths Day games. World Maths Day begins earlier than the Challenge so head there now to register before it's too late.
For more information, please see this forum post.
26 Feb 2011 | 19:35:20 UTC
· Comment
World Record Generalized Woodall Prime
On 24 Feb 2011, 17:27:31 UTC, PrimeGrid’s PRPNet found the largest known generalized Woodall prime: 404882*43^404882-1
The prime is 661,368 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 1st for generalized Woodall primes and 71st overall.
The discovery was made by Ricky L. Hubbard of the United States using an AMD Athlon II X4 635 @ 2.90GHz with 8GB RAM, running Windows 7. This computer took about 4 hours and 15 minutes to complete the probable prime test using pfgw64 and a little over 30 hours 3 minutes to complete the primality test again using pfgw64. Ricky is a member of the AMD Users Team.
For more details, please see the official announcement.
25 Feb 2011 | 6:55:13 UTC
· Comment
World Maths Day Challenge
PrimeGrid's 2011 Challenge Series continues with the "World Maths Day Challenge". World Maths Day is a day to promote numeracy through games and competition. It has been created for students aged 4 - 18 years with the addition for the first time this year of an adult category, ages 19 to 119. Compete against others around the world in live games of mental arithmetic.
In honor of World Maths Day, PrimeGrid is offering 24 Challenge (1-2 March) on The Riesel Problem (Sieve) application. For more information, please see this forum post.
p.s. Please spread the word about World Maths Day. Their goal this year is to achieve 1 billion correct answers.
22 Feb 2011 | 17:14:53 UTC
· Comment
World Record Generalized Fermat Prime
On 8 Feb 2011 09:38:57 UTC, PrimeGrid’s PRPNet found the largest known Generalized Fermat Prime: 145310^262144+1
The mega prime is 1,353,265 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 1st for Generalized Fermat Primes and 23rd overall.
The discovery was made by Ricky L Hubbard of the United States using an AMD PHENOM II X6 1090t @ 3.2GHz with 8GB RAM, running Windows 7. This computer took about 11 hours to probable prime (PRP) test with GenefX64 and 48 hours and 15 minutes to complete the primality test using pfgw64. Ricky is a member of the AMD Users team.
For more details, please see the official announcement.
10 Feb 2011 | 6:20:23 UTC
· Comment
State of the validator after the challenge
Because of the massive amount of work that we received during the challenge, we have a big backlog for the validator to process. While it may seem that validation has stopped, it is simply not true, and validator is working through the backlog. This backlog also causes problems displaying pending credit page for some users.
We estimate that the valitator will catch up in less than a week. Until then credit for newly reported results may be slightly delayed.
8 Feb 2011 | 10:29:13 UTC
· Comment
The Year of the Rabbit Challenge Preliminary results
What an amazing amount of work completed and a ton of primes found. Although the validator was overwhelmed early on, the server held up to the stress (fortunately this did not affect scoring).
Once again, it was exciting to see the top teams go neck and neck to the wire. This Challenge will set several records. We'll need a few days to process the data. A lot of xGFN testing is left to do on the found primes so expect them to roll out over the next few days. :)
The Challenge is over and now the "clean up" process begins. We are expecting roughly a week but hoping for less.
Official results are most likely less than a week away, but for preliminary results, please see this forum post. Thank you to everyone who participated.
6 Feb 2011 | 20:38:05 UTC
· Comment
The Year of the Rabbit Challenge begins
The Challenge has begun, but first you must answer these three questions before you cross the bridge of primes. What is your name? What is your quest? What is the name of the prime where k=n?
For more information about the Challenge, please see this forum post. Best of Luck to everyone!
3 Feb 2011 | 18:00:25 UTC
· Comment
The Year of the Rabbit Challenge in 24 hours
In the immortal words of Tim the Enchanter, "I warned you! But did you listen to me? Oh, no, you knew it all, didn't you? Oh, it's just a harmless little bunny, isn't it?" Watch out for those primes...some of them can be quite hard to tame. Beware of the ones with nasty big pointy teeth. :)
A 3 day (3-6 Feb) Year of the Rabbit Challenge is being offered on PrimeGrid's Proth Prime Search (LLR) application. For more information, please see this forum post.
2 Feb 2011 | 22:33:49 UTC
· Comment
The Tour de Primes begins!
Come join us in laid-back competition in tribute to the number 2...the first prime and the only even prime. The prizes are simple colored jerseys . Yellow for the most primes, Green for the highest prime score, and Checkered for the most primes on 5 Feb. No pressure or stress other than what you put on yourself. :) For more information, please see Tour de Primes 2011.
1 Feb 2011 | 0:01:32 UTC
· Comment
The Year of the Rabbit Challenge in 3 days
"Thou shalt count to three, no more, no less. Three shalt be the number thou shalt count, and the number of the counting shalt be three. Four shalt thou not count, nor either count thou two, excepting that thou then proceed to three. Five is right out. Once the number three, being the third number, be reached, then lobbest thou thy Holy Host of Antioch towards thou task, who being naughty in my sight, shall snuff it." ;)
A 3 day (3-6 Feb) Year of the Rabbit Challenge is being offered on PrimeGrid's Proth Prime Search (LLR) application. For more information, please see this forum post.
31 Jan 2011 | 19:19:17 UTC
· Comment
The Year of the Rabbit Challenge
You know what they say about rabbits? Well, we hope it's the same for primes during this Challenge. :D Come join us as we propagate the Top 5000 list with a litter of kits...I mean, a bunch of primes! It's a GREAT opportunity for you to find a prime for yourself! Who knows, there may even be the rare Fermat number divisor. :)
A 3 day (3-6 Feb) Challenge is being offered on PrimeGrid's Proth Prime Search (LLR) application. For more information, please this forum post.
29 Jan 2011 | 2:05:23 UTC
· Comment
Tour de Primes 2011
February is just a few days away which means it is almost time for the 3rd annual Tour de Primes. 2 is the first prime number...and the only even one. Therefore, we have declared February, the 2nd month, as prime month.
We're offering a small informal competition in tribute to this unique prime number. There are no points to be gained or awards to be won...just a simple colored jersey (Yellow, Green, and Checkered) at the end of the month. No pressure or stress other than what you put on yourself. :) For more information, please see Tour de Primes 2011.
27 Jan 2011 | 18:26:40 UTC
· Comment
Mega Prime found for The Riesel Problem
On 14 Jan 2011 9:03:07 UTC, PrimeGrid’s The Riesel Problem project eliminated k=428639 by finding the Mega prime: 428639*2^3506452-1
The prime is 1,055,553 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 29th overall. This is the 2nd largest prime found in The Riesel Problem and PrimeGrid's second elimination in 2 months. 62 k's now remain.
The discovery was made by Brett Melvold of Australia using an Intel i7 920 @ 2.67GHz with 6GB RAM, running Windows 7. This computer took 11 hours and 13 minutes to complete the primality test using LLR. Brett is a member of the BOINC@AUSTRALIA team.
For more details, please see the official announcement.
18 Jan 2011 | 17:31:53 UTC
· Comment
GFN PRPNet Challenge - Results
The GFN Prime Search PRPNet Challenge was a nice success. Congratulations to Senji Yamashita (s-yama) as the top individual scorer. Additional congratulations goes out to Amy Chambers (Buckeye74) who found PrimeGrid's first GFN prime in this search. This prime was quickly followed less than an hour and a half later by another prime discovered by Ross Goudie (Ross*). The goal of finding at least one GFN prime was achieved. For complete scores, please see here.
The search continues with the month long goals of finding a prime at each of the following N's: 65536, 262144, 524288. For more information, please see the GFN Prime Search. BTW, the GPU really shines at the higher N's. :)
17 Jan 2011 | 15:59:24 UTC
· Comment
January's PRPNet Challenge Project on GFN
Pierre de Fermat (1601-1665) is often called the "Prince of Amateurs." It is in his honor that the first PRPNet Challenge of 2011 is on the Generalized Fermat Number (GFN) Prime Search. A 3 day Challenge is being offered starting 12 January 2011 00:00 UTC on PrimeGrid's PRPNet. NOTE: PrimeGrid's BOINC Challenge series doesn't start until 3 February 2011.
With the breakthrough of porting Genefer 2.2.0 to the GPU (CUDA), the search has become much more attractive. Testing times for the higher N's have been drastically reduced. NOTE: GPU app requires double precision support. Come be the first at PrimeGrid to report a Top 5000 prime found by a GPU.
For more information, please see this forum thread.
9 Jan 2011 | 8:31:08 UTC
· Comment
Sierpinski/Riesel Base 5 Project
With the success of The last 10 Days of 2010 PRPNet Challenge, we are happy to announce that a collaboration has been formed between PrimeGrid and the Sierpinski/Riesel Base 5 Project. This is a combination of the SoB and TRP projects, except for the base of 5 instead of 2.
SR5 will enter PrimeGrid's Project Staging Area. The goal will be to make 2011 the best year of the project in terms of work completed. For more information about the SR5 Project, please see this forum post.
7 Jan 2011 | 19:59:27 UTC
· Comment
Happy New Year 2011!
Happy New Year 2011...a prime number year! Here's a little trivia from Prime Curios!:2011 - Two thousand "eleven" is the sum of 11 consecutive primes. Can you find them? [Post]
1 Jan 2011 | 0:56:37 UTC
· Comment
2010 Challenge Series Final Rankings
PrimeGrid's 2010 Challenge Series is final. This year saw tremendous growth as well as tougher competition. The expansion of "scoring positions" was a nice success and allowed more users and teams to participate in the rankings.
Congratulations to SETI.USA as the top team and Mr. Hankey as the top individual. They are the winners of PrimeGrid's 2010 Challenge Series. For complete, extended rankings please see: Individuals | Teams
As always, thank you for your help and support. We continue to be humbled by your participation. None of this is possible without YOU! :) Have a safe and happy Holiday season. See you next year for PrimeGrid's 2011 Challenge Series!
31 Dec 2010 | 18:49:09 UTC
· Comment
Unexpected downtime
We had some downtime because of database issues. They should be resolved and the work should be flowing fine now.
31 Dec 2010 | 14:15:52 UTC
· Comment
SR5 PRPNet Challenge - fourth and fifth prime!
The stars must have aligned today as two SR5 primes were found in the Challenge. One by Murphy Babb (his second) of the United States and one by Sascha Beat Dinkel of Switzerland. Murphy's prime (3938*5^558032-1) is 390,052 digits and ranks 3rd for SR5 primes and 218th overall. Sascha's prime (151026*5^559670-1) is 391,198 digits and ranks 2nd for SR5 primes and 216th overall.
This is a GREAT way to lead into the final 24 hours of the Challenge. Looks like we've even hit the 5 primes request. What more is there to ask for now??? :D How about an SR5 prime for everyone participating? Is that too lofty of a goal?
If you are interested in participating, please see the Last 10 Days of 2010 PRPNet Challenge post.
31 Dec 2010 | 2:50:10 UTC
· Comment
SR5 PRPNet Challenge - third prime!
Matthew Poulter of the United Kingdom has found the third prime of the SR5 PRPNet Challenge. It is 385,673 digits and ranks 2nd for SR5 primes and 224th overall in the Top 5000 primes database!
105782*5^551766-1
Now that 2010 has become the best year of the project, let's see how far we can push it. With just over 2 days left in the Challenge, we have an opportunity to find a couple more primes and make 2010 head and shoulders above the rest.
If you are interested in participating, please see the Last 10 Days of 2010 PRPNet Challenge post.
29 Dec 2010 | 20:41:02 UTC
· Comment
SR5 PRPNet Challenge - second prime!
Murphy Babb of the United States has found the second prime of the SR5 PRPNet Challenge. And what a nice one it is...coming in ranked 4th for SR5 primes and 265th overall in Top 5000 primes database!
183916*5^519597-1
This prime marks a nice milestone for the SR5 project. Removing k=183916 brings the sieve file to less than 3M terms remaining (to n=2M). The current sieve file has 2,982,533 terms in 181 sequences.
Only one more prime is needed to make 2010 the best year of the SR5 project in regards to prime score. If you are interested in participating, please see the Last 10 Days of 2010 PRPNet Challenge post.
27 Dec 2010 | 21:32:59 UTC
· Comment
SR5 PRPNet Challenge
Michał Gasewicz of Poland has found the first prime of the SR5 PRPNet Challenge. Yes, the same "lucky" person who found the World Record Primorial prime last week...even with the same computer!!! This is most definitely a good holiday season for him. :)
53542*5^515155-1
Only two more primes are needed to make 2010 the best year of the SR5 project in regards to prime score. If you are interested in participating, please see the Last 10 Days of 2010 PRPNet Challenge post.
NOTE: Anyone needing assistance in joining the PRPNet Challenge, an individualized package can be created for you. All you'd have to do is download, unzip, and double click a few times and...PRPNet will do the rest. :) Builds are available for Linux, Mac, and Windows.
26 Dec 2010 | 1:10:03 UTC
· Comment
World Record Primorial Prime
On 20 Dec 2010, 08:05:22 UTC, PrimeGrid’s PRPNet found the largest known Primorial prime: 843301#-1
The prime is 365,851 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 1st for Primorial primes and 260th overall.
The discovery was made by Michał Gasewicz of Poland using an Intel dual Xeon E5520 @ 2.27GHz with 12GB RAM, running 64 bit Linux. This computer took about 71 hours and 20 minutes to complete the primality test using pfgw x64. Michał is a member of the BOINC@Poland team.
For more details, please see the official announcement.
24 Dec 2010 | 15:29:51 UTC
· Comment
The Winter Solstice Challenge - Final
The Winter Solstice is here!!! The solstice fires are the brightest they have ever been at PrimeGrid. The fuel came from an unprecedented amount of factors found. This Challenge benefited not only PrimeGrid's Proth Prime Search project but also the entire Riesel prime search community. A wonderful holiday gift to all those involved. :)
1.3P of sieve work was crunched in 434K tasks. A HUMONGOUS sieve that would have been impossible to do without Ken Brazier's help. A special thanks to him for his modifications to tpsieve as well as his port to GPU's.
Congratulations to Sicituradastra. as the top team and Steve* as the top individual. Remember, the top 100 individual and top 50 team places earn points for this Challenge. For more stats and information, please see this forum post.
This concludes PrimeGrid's 2010 Challenge Series. Overall final results will be posted soon. Thank you to everyone who participated this year. We wish you a Happy Holidays and hope to see you next year!
22 Dec 2010 | 5:42:46 UTC
· Comment
Primorial prime found in PRPNet
Tis the season to be merry!!! :) With last week's Factorial prime and today's Primorial prime, this holiday is shaping up to be quite generous.
The prime is only the 19th known p#-1 form and the 1st discovered in 18 years. It is the 1st found of either form (p#+1, p#-1) in over 9 years. Needless to say, this is exceptionally rare. It almost doubles the size of the previous record of 392113#+1 (169966 digits).
More details to come once the double check is complete.
20 Dec 2010 | 16:13:55 UTC
· Comment
The Winter Solstice Challenge in 24 hours
Soon the winter festival will begin. Come warm yourself by the Solstice fires. PrimeGrid's Challenge series ends 2010 with a 3 day (18-21 Dec) Challenge on PPS (Sieve). 32&64 bit builds are available for Mac, Linux, and Windows as well as CUDA/ATI (OpenCL) for the GPU. For more information, please see this forum thread.
17 Dec 2010 | 17:08:48 UTC
· Comment
The Winter Solstice Challenge in 3 days
PrimeGrid's Challenge series ends 2010 with the Winter Solstice Challenge. Please come join us in observing Nature's ending/beginning of a cycle...a Winter Festival on PrimeGrid's only GPU accessible project. A 3 day (18-21 Dec) Challenge is being offered on PPS (Sieve). 32&64 bit builds are available for Mac, Linux, and Windows as well as CUDA/ATI (OpenCL) for the GPU. For more information, please see this forum thread.
15 Dec 2010 | 17:41:44 UTC
· Comment
Downtime
We are going to have a short downtime today at around 12:00 UTC to install additional memory for the database server. Both BOINC server and website will not be available at that time.
Update 14:00 UTC: maintenance has been completed, and we are now running with 16GB of available memory. We will continue tweaking MySQL, so you can still expect short downtimes.
15 Dec 2010 | 9:19:03 UTC
· Comment
World Record Factorial Prime
On 14 Dec 2010 02:12:42 UTC, PrimeGrid’s PRPNet found the largest known Factorial prime: 103040!-1
The prime is 471,794 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 1st for Factorial primes and 136th overall.
The discovery was made by James Winskill of New Zealand using an Intel Core 2 Duo @ 2.13GHz with 2GB RAM, running 32 bit Windows XP. This computer took about 46 hours and 42 minutes to complete the primalty test with pfgw. James is a member of the PrimeSearchTeam.
For more details, please see the official announcement.
15 Dec 2010 | 3:49:06 UTC
· Comment
LLR 3.8.4 released for all LLR projects
Over the weekend, LLR V3.8.4_final for Linux and Mac was released for all LLR projects. Windows is still waiting for a new wrapper. Most hosts should see from 15%-20% speed up in primality testing. This will be welcomed relief in the longer LLR projects (SoB, PSP, Cullen, Woodall, 321 & TRP). Good Luck!
LLR V3.8.4 from Jean Penne uses the final V26.4 gwnum code from George Woltman.
13 Dec 2010 | 4:51:43 UTC
· Comment
Mega Prime found for The Riesel Problem
On 21 Nov 2010, 11:14:00 UTC, PrimeGrid’s The Riesel Problem project eliminated k=191249 by finding the Mega prime: 191249*2^3417696-1
The prime is 1,028,835 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 29th overall. This is the 2nd largest prime found in The Riesel Problem and the first k elimination in over 2 1/2 years. 63 k's now remain.
The discovery was made by Jonathan Pritchard of the United Kingdom using an AMD Phenom 9950 with 8GB RAM, running Windows 7. This computer took 7 hours and 31 minutes to complete the primality test using LLR. Jonathan is a member of the Turan@BOINC team.
For more details, please see the official announcement.
3 Dec 2010 | 0:19:20 UTC
· Comment
Official release of tpsieve for PPS (Sieve)
PrimeGrid is excited to finally announce the official release of the tpsieve application in the PPS (Sieve) project. Linux, Mac, and Windows platforms for 32/64 bit are all supported as well as CUDA and OpenCL (ATI). Only Mac OpenCL is NOT currently available. Also, OpenCL requires an app_info file to run due to a scheduling request issue. However, we hope to have that problem resolved before the next Challenge (18-21 December). NOTE: Windows GPU users should update to .NET Framework 3.5.
tpsieve, based on Geoff Reynolds' original code, is a revolution to k*2^n+1/-1 sieving. Thanks in large part to Ken Brazier's updates and modifications to include simultaneous +1/-1 dat-less sieving as well as his ports to the GPU, tpsieve has changed the landscape of sieving and is now providing incredible support to the prime finding community.
Thank you Ken!!!
1 Dec 2010 | 16:31:28 UTC
· Comment
The Leonids Challenge - Final
The results are final. What a splendid show for both the Leonids and the Challenge. Over 100 single primes were returned during the Challenge...greatly exceeding our expectation. Unfortunately, no luck with finding a Sophie Germain or twin prime.
719K tasks were completed resulting in over 6.1M Challenge points awarded. Congratulations to Team Norway as the top team and shanky123 as the top individual. For more stats and information, please see this forum post.
Thank you to everyone who participated!!! The final Challenge of 2010 is the Winter Solstice Challenge...come join us 18-21 December for 3 days on the Proth Prime Search (Sieve) application! As this year's only GPU application Challenge, it's sure to light the solstice fires!!!
29 Nov 2010 | 22:17:04 UTC
· Comment
Prime found in The Riesel Problem!!!
The first prime in almost 2 1/2 years has been discovered for The Riesel Problem. More details to come after the primary finder has responded.
EDIT (29 Nov): Still awaiting contact from UserID 53352 (Jonathan Pritchard) of the Turan@BOINC team.
24 Nov 2010 | 16:51:22 UTC
· Comment
The Leonids Challenge - Preliminary results
What a splendid show for both the Leonids and the Challenge. Once again, it was exciting to see the top 2 teams go neck and neck to the wire. Also, through the top 100 users, there are many positions separated by a single task. So far, no luck with finding a Sophie Germain or twin prime, but there were over 110 single primes returned during the Challenge...greatly exceeding our expectation.
The Challenge is over and now the "clean up" process begins. As a nice contrast to the Calendula Challenge, this one is shaping up to be very short.
Official results are most likely less than a week away, but for preliminary results, please see this forum post. Thank you to everyone who participated.
19 Nov 2010 | 4:02:56 UTC
· Comment
The Leonids Challenge in 24 hours
Come join us at the peak of the Leonids for a 24 hour Challenge on the Sophie Germain Search (LLR) project. A Sophie Germain prime or even a twin prime may be waiting for you. ;) For more information, please see this forum post.
16 Nov 2010 | 17:09:40 UTC
· Comment
The Leonids Challenge in 3 days
In 3 days, the Leonids Challenge will begin. Come watch the "falling stars" and hopefully find an elusive Sophie Germain prime or even a twin. A 24 hour (17-18 November) Challenge is being offered on The Sophie Germain Prime Search (LLR) application. For more information, please see this forum post.
14 Nov 2010 | 15:05:08 UTC
· Comment
Proth Prime Search (Sieve)
The PPS (Sieve) will be pausing soon. When the current buffer empties and all outstanding work has been completed and validated, we'll be switching applications from ppsieve to tpsieve. This will allow for combined sieving of both +1 and -1 forms. For more information, please see this thread.
We hope to resume in less than a week. :)
9 Nov 2010 | 18:37:52 UTC
· Comment
Preparing for Leonids II
This is a reminder that the 2nd test run is coming up today Sunday, 7 Nov 2010 18:00 UTC. Again it will be on the PPS (LLR) project. We'll be looking for a good balance between request handling speed and amount of tasks in memory. For this one, we'll need as many hosts as possible hitting the server at the start.
For results of the 1st test run, please see this post.
Thank you for your help! :)
7 Nov 2010 | 7:02:36 UTC
· Comment
Test run results
The test run today was very productive. Thank you to everyone who participated. For details on what we learned, please see this post.
A new one hour test run has been scheduled for Sunday, 7 Nov 2010 18:00 UTC. Again it will be on the PPS (LLR) project. We'll be looking for a good balance between request handling speed and amount of tasks in memory. For this one, we'll need as many hosts as possible hitting the server at the start.
Thanks again for your help! :)
3 Nov 2010 | 21:26:34 UTC
· Comment
Preparing for Leonids
The Leonids Challenge is coming up on 17 November 2010. The project is the Sophie Germain Prime Search which uses LLR to primality test candidates to find twin or Sophie Germain primes. With the new LLR v3.8.2 app, testing times have dropped in some cases as much as 20%. Therefore, while we still have time, we'd like to conduct test runs to evaluate server load.
The first run will be 3 November 2010 at 18:00. We'd like to run a 1 hr test on PPS (LLR) and produce as much stress as possible. We'll be monitoring load and making changes as necessary. If PPS (LLR) can run well under load, then SGS will as well with its longer tasks. For information, please see this forum thread.
1 Nov 2010 | 16:36:27 UTC
· Comment
Work stats file move
Work stats file detailing user work done per subproject will be moved from /stats/ to /stats_work/ on Monday, November 8th. The new location is already live; everyone who is using the work stats file should update their scripts.
Note that the location change does not affect standard stats files.
1 Nov 2010 | 10:32:02 UTC
· Comment
PSP/SoB (Sieve) nears end
The work buffer for PSP/SoB (Sieve) has reached 0. All that remains is work in progress. Since the deadline for these tasks is 7 days, we expect completion in a week or two depending on the number of expired tasks. Please see this post for updates on remaining tasks.
Suspension of the this sieve is a GREAT milestone. Congratulations to everyone who participated.
19 Oct 2010 | 2:28:06 UTC
· Comment
The Calendula Challenge - Preliminary results
For such a marathon of a Challenge, it was exciting to see the many close battles taking place. What's amazing is how close the top two spots were for both the team and individual categories. Although no one found the golden flower (PSP prime), excellent progress was made advancing the search.
The Challenge is over and now the "clean up" process begins. If you have the resources, please consider joining in the "clean up". We greatly appreciate any help. However, we fully understand the need/desire to "move on".
Official results are probably 6-8 weeks away, but for preliminary results, please see this forum post. Thank you to everyone who participated.
8 Oct 2010 | 3:13:56 UTC
· Comment
World Record Factorial Prime
On 04 Oct 2010, 15:01:15 UTC, PrimeGrid’s PRPNet found the largest known Factorial prime: 94550!-1
The prime is 429,390 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 1st for Factorial primes and 155th overall.
The discovery was made by Dmitry Domanov of Russia using an Intel Intel Xeon E5310 @ 1.60GHz with 4GB RAM, running 32 bit Windows 2003 Server. This computer took 24 hours and 19 minutes to complete the prime test using pfgw. Dmitry is a member of Team Russia.
For more details, please see the official announcement.
6 Oct 2010 | 3:32:43 UTC
· Comment
PSP/SoB (Sieve) to be suspended
13 October 2010 is approaching. This will be the last insertion date for PSP/SoB (Sieve) before it is suspended. Until then, the queue will be kept full for anyone wishing to complete their last effort on this project.
This is a major accomplishment for both the Prime Sierpinski Problem and the Seventeen or Bust projects. For more information, please see this forum thread.
5 Oct 2010 | 18:23:56 UTC
· Comment
The Calendula Challenge - 3 days remain!
The flowers are starting to loose their fragrance and their petals are falling. Unfortunately, the long sought after golden flower has yet to bloom. :(
With 3 days remaining, it's time to start crunching those last tasks and emptying the cache. For those "moving on" after the Challenge AND have their last WU's processing, now would be a good time to set no new work. For more information, please see this forum post.
4 Oct 2010 | 14:52:36 UTC
· Comment
The Calendula Challenge in 24 hours
The Calendula Challenge will soon begin. A 13 day (24 Sept - 7 Oct) Challenge is being offered on The Prime Sierpinski Problem (LLR) application. For more information, please see this forum post.
Come early and participate in the "All hands on deck" request for PPS (LLR). This is a GREAT warm-up ahead of the Challenge.
23 Sep 2010 | 18:08:46 UTC
· Comment
The Calendula Challenge in 3 days
In 3 days, the Calendula Challenge will begin. Come watch the flowers bloom and hopefully find a 3 million digit Mega Prime! A 13 day (24 Sept - 7 Oct) Challenge is being offered on The Prime Sierpinski Problem (LLR) application. For more information, please see this forum post.
Also, come visit the forum and read about the "All hands on deck" request for PPS (LLR). This is a GREAT warm-up ahead of the Challenge.
21 Sep 2010 | 16:42:30 UTC
· Comment
New badge level
A new badge level, Ruby, has been added, and badge level for Amethyst has been lowered.
The current badge levels are:
- For LLR projects: 10 / 100 / 500 / 1000 / 2000 thousand credits;
- For Sieve/AP projects: 20 / 200 / 1000 / 2000 / 4000 thousand credits.
Here's an example of the new badge for your viewing pleasure: 
19 Sep 2010 | 9:48:48 UTC
· Comment
The Calendula Challenge
PrimeGrid's Challenge Series continues with the "Calendula Challenge". Come join us on this year's most grueling Challenge...of course, it will be the most rewarding Challenge as well for Challenge Points. A 13 day (24 Sept - 7 Oct) Challenge is being offered on The Prime Sierpinski Problem (LLR) application. A prime, if found, will be over 3 million digits long and rank as the 11th largest prime. For more information, please see this forum post.
14 Sep 2010 | 15:03:28 UTC
· Comment
Planned maintenance tonight
Tonight we might have a downtime because of some maintenance in the datacenter. Fill your caches!
[update] After the maintenance the servers did not respond so we had to do a hard reboot. Hopefully everything is fine now.
24 Aug 2010 | 15:11:01 UTC
· Comment
The Dog Days of Summer in 24 hours
When will the end come to this summer heat??? As soon as Sirius is separated from the sun!!! In 24 hours, come join us to help hasten Sirius' departure and thus, bring back cooler days. A 48 hour Challenge is being offered on the 321 Prime Search (Sieve). For more information, please see this forum thread.
19 Aug 2010 | 18:17:32 UTC
· Comment
The Dog Days of Summer in 2 days
The time draws near to the chase. Sirius must be driven away from the Sun so that we can rid ourselves of this long hot sweltering summer (Northern Hemisphere). In 2 days, the Dog Days of Summer Challenge will begin. The 48 hour Challenge is being offered on PrimeGrid's 321 Prime Search (Sieve) application. Please come join us as we quicken the return of cooler days. :) For more information, please see this forum thread.
18 Aug 2010 | 14:18:51 UTC
· Comment
PrimeGrid Donation Drive 2010 Fall
PrimeGrid is a project that is not financed by universities or commercial entities. In fact, all of our funding comes from the community, most of it through the donations page and a small amount through Google ads on the site. In the previous months donations were enough to cover all expenses running the website, however, the last few months have been particularly bad and just paying for server collocation has cut deep into our emergency funds.
It is never easy to be asking for money, but it has come to the point where we have to. We currently have money to keep the servers running for two more months. After that, we either shut down or throttle down significantly, which would be a shame having established PrimeGrid as a significant power in the prime number community, and having received uncountable hours of support from the members.
Therefore, we are launching PrimeGrid Donation Drive 2010 Fall. We have set the target to €4000, which would allow us continue the service for a whole year and would also restore our emergency funds.
No matter how small the donation, it still helps! However, we have to keep the minimum amount at €2 because of PayPal fees (if you prefer to donate through bank transfer, we have bank accounts in the Netherlands, Germany, Poland and Lithuania - please write a private message to me and the details will be sent to you).
To help keep the project running, please visit donations page, select the donation drive item and make a donation that you feel is suitable. Thank you in advance!
Update 2010-08-17 07:30 Big thanks to everyone who has donated already, we have almost reached 15% of the target amount. In addition, we now have a German bank account for direct transfer. If you want to make a direct deposit, please let me know by a private message.
Update 2010-08-18 15:30 By now we have almost reached 30%! Thank you for incredible support! In addition, Polish bank account has been added to the list for direct transfers.
16 Aug 2010 | 15:18:22 UTC
· Comment
The Dog Days of Summer Challenge
The Dog Days are approaching! In just 10 days, PrimeGrid's Challenge series continues with the Dog Days of Summer Challenge. Please come join us in ushering an end to the hot sweltering days of summer. A 2 day (20-22 August) Challenge is being offered on PrimeGrid's 321 Prime Search (Sieve) application. Builds are available for Linux, Mac and Windows. For more information, please see this forum thread.
10 Aug 2010 | 13:37:09 UTC
· Comment
The Full Moon Challenge - 24 hrs to go
There is coming soon a gathering of Warewolves and Prime Hunters. Be sure not to mix the two groups up or you might find yourself surrounded by blood thirsty animals!! ;) However, some might say that the two groups are NOT mutually exclusive. :D Come join us this Full Moon for a sporting "hunt" of Top 5000 primes in the Proth Prime Search (LLR) project. Application builds are available for Mac, Linux, and Windows. For more information, please see this forum thread.
24 Jul 2010 | 18:20:23 UTC
· Comment
The Full Moon Challenge
Come howl at the moon with us and "hunt" for Top 5000 primes. It's a GREAT opportunity for you to find one for yourself! Who knows, there may even be the rare Fermat number divisor. :) We hope to establish a single day record for finding Top 5000 primes!
A 24 hour Challenge (25 July) is being offered on PrimeGrid's Proth Prime Search (LLR) application. Builds are available for Mac, Linux, and Windows. For more information, please see this forum thread.
21 Jul 2010 | 5:42:44 UTC
· Comment
PSP finds another Mega Prime
The Prime Sierpinski Project has discovered their third Mega Prime: 90527*2^9162167+1. It is 2,758,093 digits long and will rank as the 12th largest known prime. The project has now found 18 primes total. There are 11 primes left to solve the Prime Sierpinski Problem. For more information, please see this forum post.
1 Jul 2010 | 18:40:10 UTC
· Comment
9 hours til the Birthday/Summer Solstice Challenge
9 hours remain til the "Birthday/Summer Solstice Challenge". Come join us in a 5 day celebration of PrimeGrid's 5th birthday. The 16-21 June Challenge on the The Riesel Problem (Sieve) application will culminate with a finale on the Summer Solstice. For more information, please see this forum post.
16 Jun 2010 | 2:34:37 UTC
· Comment
100M Cobblestones
A belated congratulations to shanky123 of Norway, for becoming the first single user account to reach 100M cobblestones (10 June) at PrimeGrid. An outstanding and amazing accomplishment after being here for just over 9 months.
Additionally, BOINCstats has just become only the 5th team to surpass 100M cobblestones. Congratulations all around.
15 Jun 2010 | 21:21:19 UTC
· Comment
Unexpected outage
We had an unexpected network and power outage at the datacenter where PrimeGrid and BOINCstats are hosted, resulting in downtime of about an hour. The service has been restored now.
Update 19:01 UTC. We will remain down until database verification completes and we are sure we have no problems.
Update 19:20 UTC. Database has been checked and we're now sending and receiving work.
13 Jun 2010 | 18:37:00 UTC
· Comment
7 days til the Birthday/Summer Solstice Challenge
Just under a week remains til the "Birthday/Summer Solstice Challenge". Come join us as we celebrate PrimeGrid's 5th birthday. A 5 day (16-21 June) Challenge is being offered on The Riesel Problem (Sieve) application. Note the special start time of 11:28 UTC so that the Challenge can end exactly on the Summer Solstice. For more information, please see this forum post.
9 Jun 2010 | 14:19:25 UTC
· Comment
PrimeGrid's Birthday/Summer Solstice Challenge
PrimeGrid's Challenge Series continues with the "Birthday/Summer Solstice Challenge". Come join us as we celebrate PrimeGrid's 5th birthday. A 5 day Challenge is being offered on The Riesel Problem (Sieve) application. The celebration will culminate on 21 June, the Summer Solstice. For more information, please see this forum post.
4 Jun 2010 | 1:55:53 UTC
· Comment
Server software upgrade
Server software has been upgraded to the latest version. It brings serveral improvements, mostly visible one probably is news forum where you can comment directly on news items.
However, as with every upgrade, there might be something that breaks, so in case you find anything not working or working not like it did previously, and you think that it's a bug, please report it in the comments for this newspost. Thanks!
11 May 2010 | 19:08:55 UTC
· Comment
200M Cobblestones
Congratulations to SETI.Germany, the first team to reach 100M cobblestones at PrimeGrid...doubling their 100M cobblestone achievement in just over 9 months!!! :)
2 May 2010 | 2:00:00 UTC
· Comment
Mega Prime for 321 Prime Search
Finally!!! A significant find during a Challenge. :) On 24 Apr 2010 11:40:07 UTC, PrimeGrid's 321 Prime Search found another Mega Prime:
3*2^6090515-1
The prime is 1,833,429 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 17th overall. This is the second mega prime for the 3*2^n-1 form, and it is the third largest found mega-digit prime using LLR. The discovery was made by David Mumper (Mumps) of the United States using an AMD Quad-Core Opteron 2378 with 8 GB RAM running Linux. This computer took just over 15 hours 24 minutes to complete the primality test. David is a member of the SETI.USA team. Official announcement and decimal representation of the prime.
26 Apr 2010 | 5:10:00 UTC
· Comment
Earth Day Challenge
Turn the turbines into the wind and the solar panels towards the sun because in less than 13 hours, the Earth Day Challenge will begin. :) Come join us for an Earth Day (22 April) + 7 day Challenge on the 321 Prime Search (LLR) application. Even if you are not able to access "green" energy, check out the Earth Day discussion thread on other ways to offset your Challenge power consumption. For more information, please see this forum post.
22 Apr 2010 | 5:10:00 UTC
· Comment
Earth Day Challenge
Earth Day is less than a week away. Hopefully the wind turbines are spinning and the solar panels are soaking up the sunlight. Come join us for an Earth Day (22 April) + 7 day Challenge on the 321 Prime Search (LLR) application. Even if you are not able to access "green" energy, check out the Earth Day discussion thread on other ways to offset your Challenge power consumption. For more information, please see this forum post.
16 Apr 2010 | 2:30:00 UTC
· Comment
First ever AP26 Found!
The search is over. A World Record AP26 (Arithmetic Progression of 26 primes) has been found. The finder is Benoãt Perichon [AF>HFR>RR] Jim PROFIT) of France. He is a member of the L'Alliance Francophone team. The AP26 progression is written as 43142746595714191+23681770*23#*n for n=0..25. It was found by a PS3 running Linux. For more details on this find, please see this forum post. Congratulations to everyone who participated in the AP26 Search. It has been a very challenging and rewarding project. Also, a special thanks to all the programmers who ported AP26 making it the most accessible project at PrimeGrid.<br /><br /> Note: there will be no more work once the queue is empty, so we would like to ask people not running for the badges to stop running AP26 subproject and give a chance for others to reach their final levels.
12 Apr 2010 | 23:55:00 UTC
· Comment
Earth Day Challenge
Earth Day is approaching so grab a couple of wind turbines and some solar panels and come join us for an Earth Day Challenge. Starting 22 April 2010, Earth Day, PrimeGrid will continue its Challenge series with an Earth Day + 7 day Challenge on the 321 Prime Search (LLR) application. Even if you are not able to access "green" energy, check out the Earth Day discussion thread on other ways to offset your Challenge power consumption. That way you can "have your cake, and eat it too!" :D For more information, please see this forum post.
8 Apr 2010 | 20:35:00 UTC
· Comment
PRPNet's Fool's Day Mini Challenge
PrimeGrid is stress testing the PRPNet software today in a PRPNet Fool's Day Mini Challenge. Why 2 April and not 1 April...because 2 is the first prime number. :) The initial stress test will last for 24 hours and start 2 April 2010 18:00 UTC. If all goes well, there will be an extended stress test that will last until 9 April 2010 18:00 UTC. If you have the time and energy, please stop by if even for just a little while. For more details, please see this forum post.
2 Apr 2010 | 15:35:00 UTC
· Comment
Record AP25 Found
A new record AP25 (Arithmetic Progression of 25 primes) has been found. It is the largest known AP25 and the 15th discovered. It has an ending term of 183651856404750473 surpassing the previous record of 178450656331295477. The finder is Chris Wingate (skinny9699) of the United States. He is a member of the Ubuntu Linux team. The AP25 progression is written as 18626565939034793+30821486*23#*n for n=0..24. It was found in the AP26 Search by an NVIDIA GeForce GTX 285 on an AMD Phenom 9750 running Linux. For more details on this find and the AP26 search, please see this forum post.
2 Apr 2010 | 15:15:00 UTC
· Comment
The Ides of March Challenge
"Et tu, Brute?" Yes, even Brutus stopped by and took down a few k/n pairs. He and the rest of the "senators" did the dirty work of rounding up over 400 prime wannabe's and placing them forever in the realm of composites. While they won't make the same notoriety as Caesar did, they will still rest in peace. The results are final. Just over 1.01P was sieved in the 24 hours of the Challenge...an astounding amount of work done. Congratulations to SETI.USA as the top team and Shanky as the top individual. Thank you to everyone who participated!!! For more stats and information, please see this forum post.
17 Mar 2010 | 2:00:00 UTC
· Comment
The Ides of March Challenge
The k/n pairs in the sieve file have been warned against a great peril on the Ides of March. Yet they arrogantly hang around hoping to be proven prime. Well, in less than 24 hours, that hope will be replaced with sheer fright. Please come join us as an honorary "senator" and help bring some k/n pairs to their demise. A 24 hour (15-16 Mar) Challenge is being offered on PrimeGrid's Prime Sierpinski Project/Seventeen or Bust (Sieve) application. For more information, please see this forum post.
14 Mar 2010 | 19:00:00 UTC
· Comment
Record AP25 Found
A new record AP25 (Arithmetic Progression of 25 primes) has been found. It is the largest known AP25 and the 14th discovered. It has an ending term of 178450656331295477 surpassing the previous record of 144822829106549969. The finder is Dave Sunderland (DaveSun) of the United States. The AP25 progression is written as 25300381597038677+28603610*23#*n for n=0..24. It was found in the AP26 Search by an Intel Pentium 4 3.20GHz running 32 bit Windows XP Professional. For more details on this find and the AP26 search, please see this forum post.
14 Mar 2010 | 7:45:00 UTC
· Comment
The Ides of March Challenge
Less than one week till it's the end for some prime wannabe's. A 24 hour (15-16 March) Challenge is being offered on PrimeGrid's Prime Sierpinski Project/Seventeen or Bust (Sieve) application. Come join us as we quicken the demise for some unlucky k/n pairs. Application builds are available for MacIntel, Linux, and Windows - with a 64 bit advantage. For more information, please see this forum post.
9 Mar 2010 | 14:15:00 UTC
· Comment
Tour de Primes 2010 has ended!!!
A very productive month for the Tour de Primes. 309 "Top 5000" primes were discovered, easily surpassing last year's mark of 212. lennart SM5YMT of Sweden and the PrimeSearchTeam once again topped the leader boards winning his second yellow jersey in a row. He also picked up the green jersey for the first time. [SG]marodeur6 of Germany and team SETI.Germany takes home the checkered jersey. For more details about the tour and complete standings, please see this forum post.
1 Mar 2010 | 21:35:00 UTC
· Comment
BEWARE the Ides of March!!!
PrimeGrid's Challenge series continues with the Ides of March Challenge. Once again we observe Caesar's demise by finding factors that will bring some k/n pairs to their demise. A 24 hour (15-16 March) Challenge is being offered on PrimeGrid's Prime Sierpinski Project/Seventeen or Bust (Sieve) application. For more information, please see this forum post.
1 Mar 2010 | 20:40:00 UTC
· Comment
New AP25 Found
A new AP25 (Arithmetic Progression of 25 primes) has been found. It is the 13th discovered. The finder is Keith Pattenden ([url=http://www.primegrid.com/show_user.php?userid= 18217]KWSN - Sir Brian - err sorry - wrong film![/url]) of the United Kingdom. He is a member of the The Knights Who Say Ni! team. The AP25 progression is written as 42592855872841649+19093314*23#*n for n=0..24. It was found by an NVIDIA GeForce GTX 260 in an Intel Core2 Quad 6600 @ 2.40GHz running 32 bit Windows XP Professional. For more details on this find and the AP26 search, please see this forum post.
25 Feb 2010 | 13:00:00 UTC
· Comment
New AP25 Found
A new AP25 (Arithmetic Progression of 25 primes) has been found. It is the 12th discovered. The finder is Bryan Little (mfl0p) of the United States. He is a member of the [H]ard|OC team. The AP25 progression is written as 58555890166091939+10416756*23#*n for n=0..24. It was found by an NVIDIA GeForce GTX 260 in an Intel Core2 Quad @ 2.40GHz running Linux. For more details on this find and the AP26 search, please see this forum post.
24 Feb 2010 | 19:30:00 UTC
· Comment
The Year of the Tiger Challenge
The results are final. Cupid and the Tiger ravaged the primes - bringing in an unprecedented 110 "new" primes to the Prime Pages with over half of those making it into the Top 1000. Over 2M tasks (1M WU's) were completed resulting in over 23M cobblestones awarded...an astounding amount of work done for an LLR Challenge. Congratulations to SETI.USA as the top team and Mr. Hankey as the top individual. Thank you to everyone who participated!!! For more stats and information, please see this forum post.
23 Feb 2010 | 14:50:00 UTC
· Comment
Planned maintenance
We will be doing software upgrades on the servers in the upcoming few hours that might make the website temporarily inaccessible. We will update this post when the updates are complete. <br /><br /> Update 14:05 UTC: maintenance has been completed successfully.<br /> Update 15:07 UTC: turns out database is misbehaving, so we need to extend the outage.<br /> Update 17:00 UTC: it seems that everything is running fine.
21 Feb 2010 | 11:45:00 UTC
· Comment
The Year of the Tiger Challenge
Less than 4 hours remain. The hunt has been very successful for Cupid and the Tiger. Just as PrimeGrid's validator is struggling to keep up with the Challenge, the Prime Pages' validator is struggling to keep up with the prime submissions. :D Over 75 "Top 5000" primes have been found so far!!! There's still time to join the hunt. For more information, please see this forum thread.
17 Feb 2010 | 14:10:00 UTC
· Comment
The Year of the Tiger Challenge
24 hours into the Challenge and Cupid and the tiger have been very successful in their hunt for primes - already snagging over 35 "Top 5000" primes. 48 hours remain so it's not too late to jump in the fray and see if you too can capture a prime. For more information, please see this forum thread.
15 Feb 2010 | 18:00:00 UTC
· Comment
The Year of the Tiger Challenge
Only 24 hours remain till the start of the 2010 Challenge Series and Valentine's Day in the West and the Year of the Tiger in the East. Cupid is flying overhead while the tiger circles below. Please come join us in an East & West fearless attack on Proth Primes. A 3 day (14-17 Feb) Challenge is being offered on PrimeGrid's Proth Prime Search (LLR). Application builds are available for Mac, Linux, and Windows. For more information, please see this forum thread.
13 Feb 2010 | 18:00:00 UTC
· Comment
The Year of the Tiger Challenge
One week till the start of the 2010 Challenge Series with the Year of the Tiger. A 3 day (14-17 Feb) Challenge is being offered on PrimeGrid's Proth Prime Search (LLR). Come join us as we stalk the primes. Application builds are available for Mac, Linux, and Windows. For more information, please see this forum thread.
7 Feb 2010 | 14:50:00 UTC
· Comment
54 digit factor to F14!!!
GIMPS has found another Fermat factor, a 54 digit factor to F14!!! What makes this unique and exciting is that it is the first factor for F14. It was found by Tapio Rajala of Finland. For more information on this discovery, see this mersenne forum thread. For more information about the factoring status of Fermat numbers, please see Wilfrid Keller's Prime factors of Fermat numbers site.
4 Feb 2010 | 18:45:00 UTC
· Comment
The Year of the Tiger Challenge
We are kicking off the 2010 Challenge Series with the Year of the Tiger Challenge which just so happens to coincide with Valentine's Day in the West. The Tiger is the third sign in the Chinese Zodiac cycle, and it is a sign of fearlessness. It is considered incredibly brave, evidenced by its willingness to engage in battle. So whether it's your love of Tigers or love of primes, please come join us in an East & West fearless attack on Proth Primes. A 3 day (14-17 Feb) Challenge is being offered on PrimeGrid's Proth Prime Search (LLR). Builds are available for Mac, Linux, and Windows. For more information, please see this forum thread.
3 Feb 2010 | 2:30:00 UTC
· Comment
New AP25 Found
A new AP25 (Arithmetic Progression of 25 primes) has been found. It is the 11th discovered. The finder is Jan Stenzel (Jan Stenzel) of Poland. He is a member of the BOINC@Poland team. The AP25 progression is written as 49644063847333931+7851809 *23#*n for n=0..24. It was found by an Intel Core i7 860 @ 2.80GHz running 64 bit Windows 7. For more details on this find and the AP26 search, please see this forum post.
2 Feb 2010 | 4:20:00 UTC
· Comment
Tour de Primes 2010
The Tour de Primes begins. Come join us in laid-back competition in tribute to the number 2...the first prime and the only even prime. The prizes are simple colored jerseys . Yellow for the most primes, Green for the highest prime score, and Checkered for the most primes on 17 Feb. No pressure or stress other than what you put on yourself. :) For more information, please see Tour de Primes 2010.
1 Feb 2010 | 0:00:00 UTC
· Comment
Seventeen or Bust
On the eve of the Tour de Primes 2010, we are happy to announce that PrimeGrid is partnering with Seventeen or Bust to help solve the Sierpinski problem! This finally brings PrimeGrid full circle with SoB/PSP primality testing as well as combined sieving. Special thanks to Louis Helm of Seventeen or Bust for helping to make this collaboration possible! For more details on the new search, please see this forum thread.
31 Jan 2010 | 17:30:00 UTC
· Comment
Tour de Primes 2010
February is a couple of days away which means it's time for the Tour de Primes. 2 is the first prime number...and the only even one. Therefore, we have declared February, the 2nd month, as prime month. We're offering a small competition in tribute to this unique prime number. There are no points to be gained or awards to be won...just a simple colored jersey (Yellow, Green, and Checkered) at the end of the month. No pressure or stress other than what you put on yourself. :) For more information, please see Tour de Primes 2010.
30 Jan 2010 | 0:30:00 UTC
· Comment
New AP25 Found
A new AP25 (Arithmetic Progression of 25 primes) has been found. It is only the 10th discovered. The finder is Gerrit Slomma (roadrunner_gs) of Germany. He is a member of the Special: Off-Topic team. The AP25 progression is written as 46428033558097831+12893265*23#*n for n=0..24. It was found by an Intel Core2 6400 @ 2.13GHz running Linux. For more details on this find and the AP26 search, please see this [url=http://www.primegrid.com/forum_thread.php?id=1246&nowrap=true# 20398]forum post[/url].
15 Jan 2010 | 16:00:00 UTC
· Comment
New AP25 Found
A new AP25 (Arithmetic Progression of 25 primes) has been found. It is only the 9th discovered. The finder is Dan Swearingen (endearingswan) of the United States. The AP25 progression is written as 24715375237181843+19071018*23#*n for n=0..24. It was found by an Intel Pentium 4 @ 3.00GHz running 32 bit Windows XP Professional. For more details on this find and the AP26 search, please see this forum post.
5 Jan 2010 | 15:35:00 UTC
· Comment
Megabit Prime for 27121 Search
On 23 Dec 2009, PrimeGrid's PRPNet found a megabit prime: 27*2 2218064+1 The prime is 667,706 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 56th overall. The discovery was made by Honza Cholt (Honza) of the Czech Republic using a dual Intel Xeon @ 3.06GHz with 4GB RAM. This computer took 2 hours 38 minutes and 59 seconds to complete the primality test. Honza is a member of the team BOINC.SK For more details about this search, please see this forum thread.
26 Dec 2009 | 6:25:00 UTC
· Comment
2009 Challenge Series
PrimeGrid's 2009 Challenge Series has concluded. Congratulations to SETI.Germany (repeat Champion) as the top team and j2satx as the top individual. They are the overall winners to PrimeGrid's 2009 Challenge Series. For a list of other top finishers, please see this forum thread. As always, thank you for your help and support. None of this is possible without YOU! :) Have a safe and happy Holiday season. See you next year for PrimeGrid's 2010 Challenge Series!
24 Dec 2009 | 7:40:00 UTC
· Comment
The Winter Solstice Challenge
The Winter Solstice is here!!! And the results are final. But the night is far from dark. The solstice fires are brighter than ever as the final Challenge of 2009 also happens to be the most active Challenge to date. Over 970K WU's were completed resulting in over 34.4M cobblestones awarded...an astounding amount of work done. Although no AP26 was found, six new AP24's were found along with countless smaller ones. Congratulations to SETI.USA as the top team and Mr. Hankey as the top individual. For more stats and information, please see this forum post This concludes PrimeGrid's 2009 Challenge Series. Overall final results will be posted soon. Many thanks goes out to everyone who participated!!! We wish you a Happy Holidays and see you next year!
21 Dec 2009 | 21:00:00 UTC
· Comment
The Winter Solstice Challenge
The Winter Solstice is in 3 hours...and so too is the conclusion of the Challenge. Now is the time to start preparing for the finale. Please remember to upload early and often. The server is going to get hit hard as the Challenge draws to an end. We will start to lower "max cache" to help with this. There continues to be a lot of close races so don't miss out on your completed WU's. Best of Luck in these last 3 hours.
21 Dec 2009 | 14:47:00 UTC
· Comment
The Winter Solstice Challenge
Over half way through and the solstice fires are exceptionally bright. So far four new AP24's have been found. Also, there are several very close races in the individual category. The Winter Solstice is almost upon us. It is not too late to come join the Winter Festival and warm yourself by the fires. For more information on how to join, please see this forum thread.
20 Dec 2009 | 14:00:00 UTC
· Comment
The Winter Solstice Challenge
Only 13 hours remain till the Winter Solstice Challenge. The pre-fires have a nice red glow, and we're expecting them to turn a deep blue once the Challenge begins. Who knows...by the end of the Challenge they may even become white hot. :) Please come join us in a Winter Festival that is sure warm you up. The top spots for the 2009 Challenge Series are up for grabs. A 3 day (72 hour) Challenge is being offered on PrimeGrid's AP26 Project. Builds are available for Mac, Linux, Windows, Solaris, Cell/BE Linux (Playstation 3), and for the first time, GPU-CUDA23 app. For more information on how to join, please see this forum thread.
18 Dec 2009 | 4:47:00 UTC
· Comment
Record AP25 & AP24 Found
A new record AP25 (Arithmetic Progression of 25 primes) has been found. It is the largest known AP25 and only the 6th discovered. It has an ending term of 139751114244588403 surpassing the previous record of 52115444782777781. It also includes the largest known AP24 with an ending term of 139751114244588403 surpassing the previous record of 108936498476106241. The finder is Rune Nordbøe Skillingstad (runesk) of Norway. He is a member of Team Norway. The AP25 progression is written as 12353443596260323+23793841*23#*n for n=0..24. The AP24 progression is written as 12353443596260323+23793841*23#*n for n=1..24. It was found in the AP26 Search by an NVIDIA GeForce GTX 285 on an Intel i7 CPU 940 @ 2.93GHz running 32 bit Windows...the first significant AP found by a GPU!!! For more details on this find and the AP26 search, please see this forum post.
17 Dec 2009 | 4:40:00 UTC
· Comment
The Winter Solstice Challenge
Just under 48 hours remain till the Winter Solstice Challenge. Please come join us in a Winter Festival that is sure to warm you up. If the run-up to the start is any indication, the solstice fires will be burning bright. As the team and individual rankings are so close, this Challenge will determine who takes home the 2009 Challenge Series top spot. A 3 day (72 hour) Challenge is being offered on PrimeGrid's AP26 Project. Builds are available for Mac, Linux, Windows, Solaris, Cell/BE Linux (Playstation 3), and for the first time, GPU-CUDA23 app. For more information on how to join, please see this forum thread.
16 Dec 2009 | 18:00:00 UTC
· Comment
Megabit Prime for 12121 Search
On 4 Dec 2009, PrimeGrid, in collaboration with 12121 Search, found a megabit prime: 27*2 1902689-1 The prime is 572,768 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 76th overall. The discovery was made by Peter Kaiser (Puzzle-Peter) of Germany using a dual Intel Xeon X5472 @3.0GHz with 16GB RAM. This computer took 59 minutes and 17 seconds to complete the primality test. Peter is a member of the team SETI.Germany. For more details about this search, please see this forum thread.
13 Dec 2009 | 16:20:00 UTC
· Comment
AP26 CUDA Application Released
Initial testing has gone well. Therefore, the AP26 CUDA application has been publicly released for 32 bit Windows (will run on 64 bit) and for 64 bit Linux. For more "important" information about the release, please see this forum thread.
10 Dec 2009 | 19:15:00 UTC
· Comment
Possible issues because of GPU apps.
We are working on GPU apps now so you can expect some glitches in work distribution.
10 Dec 2009 | 17:30:00 UTC
· Comment
World Record Generalized Woodall Prime
Those with triskaidekaphobia can rest at ease tonight!!! A generalized Woodall prime for base 13 has been discovered!!! The prime was found in PrimeGrid's PRPNet and is the largest known generalized Woodall prime:<br /> 563528*13563528-1 The prime is 627,745 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 1st for generalized Woodall primes and 65th overall. It is the largest non-base 2/non-generalized Fermat prime ever found. The discovery was made by Lennart Vogel (lennart SM5YMT) of Sweden using an Intel Q6600 @ 2.4 GHz with 4 GB RAM. This computer took about 3 hours and 54 minutes to complete the probable prime test. It took just over 30 hours to prove primality. For more details, please see the official announcement.
9 Dec 2009 | 5:20:00 UTC
· Comment
The Winter Solstice Challenge
PrimeGrid's Challenge series continues with the Winter Solstice Challenge. Please come join us in observing Nature's ending/beginning of a cycle...a Winter Festival to determine who will take home the 2009 Challenge Series top ranking. There is a tie in the team category and a very close race among the top 3 in the individual category. :) A 3 day (18-21 Dec) Challenge is being offered on PrimeGrid's AP26 Project. Builds are available for Mac, Linux, Windows, Solaris, Cell/BE Linux (Playstation 3), and for the first time, possibly a GPU app. For more information, please see this forum thread.
4 Dec 2009 | 6:10:00 UTC
· Comment
13 Gold Badges
Congratulations to Bruno Courty (bcoz) of France, PrimeGrid's first participant to achieve a GOLD badge in all 13 projects. This is quite a remarkable feat. A complete set of badges is a major milestone, but 13 GOLD badges is a phenomenal achievement. Bruno has been a participant at PrimeGrid since 27 Feb 2007 and is a member of the team L'Alliance Francophone. He is one of the lucky ones who received a TPS gold badge before the twin prime was found. Thank you to everyone participating. We hope to see many more achieve this milestone!
29 Nov 2009 | 21:45:00 UTC
· Comment
Record AP25 Found
A new record AP25 (Arithmetic Progression of 25 primes) has been found. It is the largest known AP25 and only the 5th discovered. It has an ending term of 52115444782777781 surpassing the old record of 38271649410634609. The finder is Ian Dickinson (Vato) of the United Kingdom. He is a member of Team-Goobee.org. The progression is written as 46176957093163301+1109121*23#*n for n=0..24. It was found in the AP26 Search by an Intel Pentium III @ 1266MHz running 32 bit Linux!!! For more details on this find and the AP26 search, please see this forum post.
25 Nov 2009 | 0:35:00 UTC
· Comment
The Giving Thanks Challenge
The results are final. Over 191K tasks were returned resulting in almost 575T completed for the PSP/SoB sieve. Congratulations to SETI.Germany as the top team and [XTBA>XTC] FRED as the top individual. In the overall Challenge Series standings, there is now a tie for the top spot between SETI.GERMANY and BOINCstats. There is also a tie for second in the individual rankings with [SG]marodeur6 and [XTBA>XTC] FRED. This sets the stage for an exciting finale in the Winter Solstice Challenge. Thank you to everyone who participated!!! For more stats and information, please see this forum post.
15 Nov 2009 | 23:00:00 UTC
· Comment
Record AP24 Found
A new record AP24 (Arithmetic Progression of 24 primes) has been found. It is the largest known AP24. It has an ending term of 104710589416588949 surpassing the previous record of 98090802848850701. The finder is Roald Solbjørg (Roald) of Norway. He is a member of Team Norway. The progression is written as 4891686128805269+19453568*23#*n for n=0..23. It was found by a PS3 in the AP26 Search. For more details on this find and the AP26 search, please see this forum post.
13 Nov 2009 | 14:20:00 UTC
· Comment
The Giving Thanks Challenge
Less than 24 hours remain till the Giving Thanks Challenge. Come join us in a 1 day (24 hour) Challenge on PrimeGrid's Prime Sierpinski Project/Seventeen or Bust (Sieve) application. Please consider running a few PSP/SoB (Sieve) WU's before the Challenge begins so your client will already have the sieve file. This way, during the Challenge, bandwidth can be used to deliver WU's instead of the sieve file. :) Thank you! For more information, please see this forum thread.
12 Nov 2009 | 18:45:00 UTC
· Comment
The Giving Thanks Challenge
PrimeGrid's Challenge series continues with the Giving Thanks Challenge. Please come join us in a celebration of PrimeGrid's users. In this season of giving thanks, we wish to thank you, the user, for another AMAZING year of crunching. A 24 hour (13-14 November) Challenge is being offered on PrimeGrid's Prime Sierpinski Problem/Seventeen or Bust (sieve) application. Builds are available for Mac, Linux and Windows. For more information, please see this forum thread.
11 Nov 2009 | 2:30:00 UTC
· Comment
Generalized Fermat Prime Search
The Generalized Fermat Prime Search has been launched in PrimeGrid's PRPNet. This is a search for primes of the form b^2^n+1. They are named after Pierre de Fermat, considered to be one of the greatest French mathematicians of the seventeenth century. For more information, please visit this forum post.
10 Nov 2009 | 3:40:00 UTC
· Comment
Record AP24 Found
A new record AP24 (Arithmetic Progression of 24 primes) has been found. It is the largest known AP24. It has an ending term of 98090802848850701 surpassing the old record of 93004136079654607. The finder is Marcus Rosario (Ritzgit) of the United States. He is a member of the Gay USA team. The progression is written as 4687877159107031+18203167*23#*n for n=0..23. It was found in the AP26 Search. For more details on this find and the AP26 search, please see this forum post.
9 Nov 2009 | 5:20:00 UTC
· Comment
Record AP24 Found
A new record AP24 (Arithmetic Progression of 24 primes) has been found. It is the largest known AP24. It has an ending term of 93004136079654607 surpassing the old record of 90769015637524109. The finder is Chris Wingate (skinny9699) of the United States. He is a member of the Ubuntu Linux team. The progression is written as 1948053460212667+17745794*23#*n for n=0..23. It was found in the AP26 Search. For more details on this find and the AP26 search, please see this forum post.
5 Nov 2009 | 5:05:00 UTC
· Comment
Record AP24 Found
A victory for the legacy systems!!! A new record AP24 (Arithmetic Progression of 24 primes) has been found. It is the largest known AP24. It has an ending term of 90769015637524109 surpassing the old record of 84418532426419063. The finder is Ian Dickinson (Vato) of the United Kingdom. He is a member of Team-Goobee.org. It was found by an Intel Pentium III @ 1266MHz running 32 bit Linux!!! The progression is written as 3634080452156039+16981607*23#*n for n=0..23. It was found in the AP26 Search. For more details on this find and the AP26 search, please see this forum post.
1 Nov 2009 | 15:15:00 UTC
· Comment
The Harvest Festival Challenge
The results are final. Over 1,490,000 tasks were completed by 200 teams and 1361 individuals resulting in over 100 new "Top 5000" primes. Congratulations to SETI.Germany as the top team and [SG]marodeur6 as the top individual. Many thanks goes out to everyone who participated!!! For more stats and information, please see this forum post.
10 Oct 2009 | 4:45:00 UTC
· Comment
Record AP24's Found
Several new AP24's (Arithmetic Progression of 24 primes) have been found...two of which are records. They were found in the AP26 Search. For more details on these finds and the AP26 search, please see this forum thread.
10 Oct 2009 | 3:15:00 UTC
· Comment
The Harvest Festival Challenge
PrimeGrid's Challenge series continues with the Harvest Festival Challenge. Please come join us in a Fall harvest of primes. A 48 hour (02-04 October) Challenge is being offered on PrimeGrid's Proth Prime Search (LLR) application. Builds are available for Linux, MacIntel and Windows. For more information, please see this forum thread.
28 Sep 2009 | 16:35:00 UTC
· Comment
Unexpected outage
Today we experienced an unexpected outage lasting several hours. It was caused by database crash which has since been repaired. The server might be a little slow while it deals with work backlog, but all requests should go through eventually. We are very sorry for the inconvenience.
28 Sep 2009 | 14:20:00 UTC
· Comment
Record AP24 Found
A new record AP24 (Arithmetic Progression of 24 primes) has been found. It is the largest known AP24. It has an ending term of 82761689028005821 surpassing the old record of 81531202836675089. The finder is Kevin Erickson (Kevin Erickson) of the United States. He is a member of the BOINCstats team. The progression is written as 10307159737232191+14120563*23#*n for n=0..23. It was found in the AP26 Search. For more details on this find and the AP26 search, please see this forum post.
19 Sep 2009 | 0:15:00 UTC
· Comment
Record AP25 Found
PrimeGrid has found a record AP25 (Arithmetic Progression of 25 primes). This is PrimeGrid’s third AP25 and only the fourth known. It has an ending term of 38271649410634609 surpassing the old record of 37814740008933889. The finder is Keith Dale ([url=http://www.primegrid.com/show_user.php?userid= 42470]GreenFish[/url]) of the United States. He is a member of team SETI.USA. The progression is written as 18162964758258289+3755664*23#*n for n=0..24. It was found in the AP26 Search. For more details on this find and the AP26 search, please see this forum post.
8 Sep 2009 | 4:45:00 UTC
· Comment
Megadigit Probable Prime Found
Congratulations to Ben Maloney (paleseptember) who discovered the megadigit probable prime 2^4583176+2131. At 1,379,674 decimal digits, this is the first known probable prime with over a million digits. It should soon appear as the new probable prime record at the website of Henri and Renaud Lifchitz, PRP Records: Probable Primes Top 10000. Ben is participating in the project "Five or Bust" - The Dual Sierpinski Problem. This project is outside of PrimeGrid and can be located in the Mersenne forum. For additional information about this project, please see the Welcome to "Five or Bust!" thread. There are only 2 remaining sequences. To help with PRP testing, see this thread. To help with sieving, see this thread.
3 Sep 2009 | 0:00:00 UTC
· Comment
Record AP25 Found
PrimeGrid has found a record AP25 (Arithmetic Progression of 25 primes). This is PrimeGrid’s second AP25 and only the third known. It has an ending term of 37814740008933889 surpassing the old record of 15523154536267043. The finder is Jochen Beck ([url=http://www.primegrid.com/show_user.php?userid= 25532]dh1saj[/url]) of Germany. He is a member of team SETI.Germany. The progression is written as 20919497549238289+3155495*23#*n for n=0..24. It was found in the AP26 Search. For more details on this find and the AP26 search, please see this forum post.
2 Sep 2009 | 14:40:00 UTC
· Comment
Record AP24 Found
Another record AP24 (Arithmetic Progression of 24 primes) found by a PS3. It is the largest known AP24. It has an ending term of 81531202836675089 surpassing the old record of 60739320360456407. The finder is Bryan Little (mfl0p) of the United States. He is a member of the [H]ard|OCP team. The progression is written as 13678065943093049+13223804*23#*n for n=0..23. It was found in the AP26 Search. For more details on this find and the AP26 search, please see this forum post.
25 Aug 2009 | 12:35:00 UTC
· Comment
The Dog Days of Summer Challenge
The Dog Days are upon us! PrimeGrid's Challenge series continues with the Dog Days of Summer Challenge. Please come join us in ushering an end to the hot sweltering days of summer. A 5 day (18-23 August) Challenge is being offered on PrimeGrid's Woodall Prime Search (LLR)) application. Builds are available for Linux and Windows. For more information, please see this forum thread.
17 Aug 2009 | 12:10:00 UTC
· Comment
Sophie Germain Prime Search
The long awaited debut of the Sophie Germain Prime Search has finally arrived. To participate, select Sophie Germain Prime Search (LLR) on your PrimeGrid preferences page. For more information, please see this forum post.
16 Aug 2009 | 15:55:00 UTC
· Comment
A Request for Assistance
We are attempting to reach two BOINC users who have made significant prime discoveries at PrimeGrid. They are both active in other BOINC projects. Therefore, we would like to make a request to the entire BOINC community for help in finding these individuals. (KE7AAR) (UPDATE: Found) of the United States and team BOINC Synergy, shares credit for the World Record Twin Primes. (spinner@) of Japan and Team 2ch is the finder of the World Record Cullen Prime. If you have contact with either of these individuals, please have them check their BOINC emails or private messages in PrimeGrid's forum. Several attempts have already been made through these channels. Additionally, if you have any information that might help us in contacting these individuals, please contact us here: http://www.primegrid.com/contact.php <br /> (Update 2009-08-15 18:00 UTC) KE7AAR has been contacted, thanks to everyone for help!
14 Aug 2009 | 1:50:00 UTC
· Comment
Cullen/Woodall Sieve
The Cullen/Woodall Sieve is active again. Both prime searches have reached n=7M in their primality testing. Therefore, combined sieving has begun on the next range of 10M PrimeGrid preferences[/url] page.
14 Aug 2009 | 1:40:00 UTC
· Comment
50M Cobblestones for SG Grid!!!
Congratulations to SG Grid, for becoming the first single user account to reach 50M cobblestones at PrimeGrid. An outstanding and amazing accomplishment after being here for less than 8 months.
9 Aug 2009 | 14:40:00 UTC
· Comment
World Record Twin Primes returned
The search is finally over!!! The Twin Primes have been discovered!!! Verification was quickly completed and the appropriate users are being contacted. Credit will be shared between the finder, top producer in terms of M, top producer in terms of primes found, and top siever. The Twin Primes were actually returned on the SAME!!! day as the Cullen Prime but were overlooked in the excitement of the Cullen. Work generation has been terminated so please select another project if TPS was your only project. The project will remain active until all outstanding work has been returned and credited. Stay tuned for more details.
6 Aug 2009 | 16:20:00 UTC
· Comment
World Record Cullen Mega Prime found
On 25 Jul 2009 1:11:48 UTC, PrimeGrid's Cullen Prime Search found another World Record Cullen Mega Prime: 6679881·26679881+1 The prime is 2,010,852 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 15th overall. It is the largest known Cullen prime and the largest found Mega Prime using LLR. This remarkable discovery comes less than 4 months after the last prime and is only the 16th known Cullen prime. Contact with PrimeGrid participant (spinner@) has not been returned. However, the participant is from Japan and is a member of Team 2ch. The prime was found using an Intel Xeon L5420 @ 2.50GHz with 6 GB RAM running Windows XP Professional. This computer took about 71 hours 58 minutes to complete the primality test. More details to come after contact is made.
5 Aug 2009 | 2:45:00 UTC
· Comment
New AP24 Found
PrimeGrid has found a new AP24 (Arithmetic Progression of 24 primes)...the first by a PS3!!! The finder is Paolo Bassi ([FVG] bax) of Italy. He is a member of team BOINC.Italy. The progression is written as 25545151920212759+1140241*23#*n for n=0..23. It was found in the AP26 Search. For more details on this find and the AP26 search, please see this forum post.
3 Aug 2009 | 17:05:00 UTC
· Comment
World Record Cullen Mega Prime returned
As unbelievable as it may sound, another Cullen Mega Prime has been discovered!!! It is only the 16th known Cullen prime. It is also a top 15 prime at over 2M digits and the largest found by LLR. Additionally, it is PrimeGrid's largest prime to date. The discoverer is from Japan and a member of Team 2ch. Verification is in progress. Stay tuned for more details.
1 Aug 2009 | 15:40:00 UTC
· Comment
New AP24 Found
PrimeGrid has found a new AP24 (Arithmetic Progression of 24 primes). The finder is Jeffrey D Sessler (Tostada) of the United States. He is a member of team Ars Technica. The progression is written as 20187352211709911+1799216*23#*n for n=0..23. It was found in the AP26 Search. For more details on this find and the AP26 search, please see this forum post.
30 Jul 2009 | 14:10:00 UTC
· Comment
New AP24's Found
While there were no AP24+ found during the Challenge, two AP24's actually were found in the hours leading up to the start. The finders are Andreas Mohr (andmore) of Germany and Tina Kent (Penguirl) of the United States. Andreas' progression is written as 19471368812966089+410682*23#*n for n=0..23 and Tina's progression is written as 20909681071069667+234797*23#*n for n=0..23. Both were found in the AP26 Search. For more details on these finds and the AP26 search, please see the following forum posts: Andreas' AP24 | Tina's AP24.
24 Jul 2009 | 18:35:00 UTC
· Comment
100M Cobblestones
Congratulations to SETI.Germany, the first team to reach 100M cobblestones at PrimeGrid...doubling their 50M cobblestone achievement in only 5 1/2 months!!! Is 150M in their sights by year's end? We'll have to wait and see. Again, congratulations! :)
24 Jul 2009 | 14:40:00 UTC
· Comment
Record AP24 Found
PrimeGrid has found a record AP24 (Arithmetic Progression of 24 primes). It is the largest known AP24. It has an ending term of 62869009767207037 surpassing the old record of 60739320360456407. The finder is Jan-Cornelius Molnar (janm) of Germany. The progression is written as 10317962076055027+10241601*23#*n for n=0..23. It was found in the AP26 Search. For more details on this find and the AP26 search, please see this forum post.
19 Jul 2009 | 18:15:00 UTC
· Comment
PlayStation3 application
We now have AP26 application for PlayStation 3. You may wish to check the forum thread in order to get it running at full speed. Thanks to mfl0p.
18 Jul 2009 | 18:35:00 UTC
· Comment
Follow PrimeGrid on Twitter
For those of you using Twitter, you can now follow PrimeGrid and watch the progress of recent findings in the AP26 Search.<br /> PrimeGrid Twitter on Web: http://www.twitter.com/primegrid. Thanks to Lexs for implementing the updates script.
18 Jul 2009 | 18:30:00 UTC
· Comment
New AP24 Found
PrimeGrid has found a new AP24 (Arithmetic Progression of 24 primes). The finder is Carsten Hartwig (SG Arsenic) of the United Kingdom. He is a member of the SETI.Germany team. The progression is written as 19516186145019209+313705*23#*n for n=0..23. It was found in the AP26 Search. For more details on this find and the AP26 search, please see this forum post.
18 Jul 2009 | 2:05:00 UTC
· Comment
The New Moon Challenge
PrimeGrid's Challenge Series continues with the New Moon Challenge. Please come join us in ushering in July's New Moon along with a new project to the Challenge Series. A 24 hour (21 July – 22 July) Challenge is being offered on PrimeGrid's AP26 (Arithmetic Progression of 26 primes) application. Builds are available for Linux, Mac, Windows, PS3, & Solaris. For more information, please see this forum thread. P.S. Also, the "most significant" Solar Eclipse this century is occuring on 22 July. :) See forum thread for more details.
14 Jul 2009 | 18:25:00 UTC
· Comment
New AP24 Found
PrimeGrid has found a new AP24 (Arithmetic Progression of 24 primes). The finder is Bryan Little (mfl0p) of the United States. He is a member of the [H]ard|OCP team. The progression is written as 7979661543967237+9936237*23#*n for n=0..23. It was found in the AP26 Search. For more details on this find and the AP26 search, please see this forum post.
12 Jul 2009 | 23:35:00 UTC
· Comment
Record AP24 Found
PrimeGrid has found a record AP24 (Arithmetic Progression of 24 primes). It is the AP24 with smallest known start. It has a starting term of 39421708111691 decreasing the old record of 167806194923077. The finder is Mark Codding (Narwhal) of the United States. He is a member of Team Picard. The progression is written as 39421708111691+9740894*23#*n for n=0..23. It was found in the AP26 Search. For more details on this find and the AP26 search, please see this forum post.
10 Jul 2009 | 14:15:00 UTC
· Comment
New AP24 Found
PrimeGrid has found a new AP24 (Arithmetic Progression of 24 primes). The finder is Paweł Feruś (mindc) of Poland. He is a member of the BOINC@Poland team. The progression is written as 5531900872160491+9383796*23#*n for n=0..23. It was found in the AP26 Search. For more details on this find and the AP26 search, please see this forum post.
6 Jul 2009 | 3:45:00 UTC
· Comment
Record AP24 Found
PrimeGrid has found a record AP24 (Arithmetic Progression of 24 primes). It is the largest known AP24. It has an ending term of 60739320360456407 surpassing the old record of 60312982868878297. The finder is Carsten Hartwig (SG Arsenic) of the United Kingdom. He is a member of the SETI.Germany team. The progression is written as 13432401425380607+9219580*23#*n for n=0..23. It was found in the AP26 Search. For more details on this find and the AP26 search, please see this forum post.
4 Jul 2009 | 13:25:00 UTC
· Comment
AP26 application available for Solaris
We have released a version of AP26 application for 64bit Solaris (on AMD x86_64 or Intel EM64T CPUs, platform name x86_64-pc-solaris). This is our first application for this platform, which also makes AP26 an application that runs on the most platforms. Thanks to Gerrit Slomma for building the app!<br /> Psst... the PS3 version is coming ;)
1 Jul 2009 | 6:30:00 UTC
· Comment
Record AP24 Found
PrimeGrid has found a record AP24 (Arithmetic Progression of 24 primes). It is the largest known AP24. It has an ending term of 60312982868878297 surpassing the old record of 25490711550130537. The finder is (AFXTBA Pitheque) of France. He is a member of the L'Alliance Francophone team. The progression is written as 14992521666441877+8832442*23#*n for n=0..23. It was found in the AP26 Search. For more details on this find and the AP26 search, please see this forum post.
30 Jun 2009 | 19:50:00 UTC
· Comment
New Top Host!
Congratulations to Worldwide Center of Mathematics, owner of the new top host at PrimeGrid. While this position has changed many times in the past, what makes this occasion unique is that this is the first time the top host is a Mac!!! EDIT: The above is in terms of RAC. In terms of total credit, UL1 holds a commanding lead of over 5M cobblestones with this host.
20 Jun 2009 | 2:05:00 UTC
· Comment
The sieves have been Mac'd out!
321, PPS, and PSP sieves now have application support for Mac OS X 10.4 running on Intel and 10.5 running on 64bit Intel. PPS sieve also offers application support for Mac OS X 10.3 running on PPC.
15 Jun 2009 | 3:25:00 UTC
· Comment
GIMPS does it again!!!
Congratulations to The Great Internet Mersenne Prime Search (GIMPS)! On April 12th, Odd Magnar Strindmo of Norway discovered the 47th known Mersenne prime, 2^42,643,801-1. It is the second largest known prime at 12,837,064 digits, only 141,125 digits smaller than the Mersenne prime found last August. The prime was independently verified June 12th. For more information, please visit the GIMPS site. Again, congratulations!!!
13 Jun 2009 | 4:20:00 UTC
· Comment
PrimeGrid's Birthday/Summer Solstice Challenge
Just over 24 hours until the start of PrimeGrid's "Birthday/Summer Solstice Challenge". A 9 day Challenge is being offered on the Prime Sierpinski Problem (LLR) application. Long Challenge, long WU's, but the rewards are greater...250 Challenge points goes to the winner and should a prime be found, it will be a Mega Prime. For more information, please see this forum post.
11 Jun 2009 | 3:45:00 UTC
· Comment
PrimeGrid's Birthday/Summer Solstice Challenge
PrimeGrid's Challenge Series continues with the "Birthday/Summer Solstice Challenge". A 9 day Challenge is being offered on the Prime Sierpinski Problem (LLR) application. We are celebrating PrimeGrid's 4th birthday on 12 June...culminating 21 June on the Summer Solstice. It seems fitting that the sun will shine the longest for the project with the longest WU. For more information, please see this forum post.
7 Jun 2009 | 6:30:00 UTC
· Comment
Record APs Found
PrimeGrid has found two new records for AP22 and AP23 (Arithmetic Progression of 22 primes and 23 primes respectively). They are the smallest known starts for each of their classifications. The finders are Jacek Kotnowski (sosnahojna - team BOINC@Poland) of Poland for the AP22 record and Eric Markle (Nikodemus - team BOINCstats) of the United States for the AP23 record. They were found in the AP26 Search. For more details on these finds and the AP26 search, please see these forum posts - AP22, AP23.
29 May 2009 | 22:30:00 UTC
· Comment
1,000,000,000 cobblestones for PrimeGrid!!!
Today, PrimeGrid surpasses the 1 Billion mark in cobblestones. From meager beginnings on 12 June 2005 to now, a tremendous amount of work has been accomplished...6 mega primes, 3 Fermat Number divisors, and over 4000 titanic primes have been discovered. Congratulation goes out to the entire community for an incredible achievement. Thank you all for your support!
20 May 2009 | 18:00:00 UTC
· Comment
Scheduled downtime
We are going to have a one to two hour downtime tomorrow, May 18, at about 12:00 GMT, because the servers have to be moved to a different rack as the datacenter is upgrading their infrastructure.
17 May 2009 | 15:15:00 UTC
· Comment
New Points Leader
Congratulations to SG Grid, for becoming the new points leader at PrimeGrid. What makes this accomplishment more amazing is that it was done in less than 5 months. The two projects that have benefited the most from this achievement are the Twin Prime Search and the Prime Sierpinski Problem. Again, congratulations!
15 May 2009 | 1:30:00 UTC
· Comment
PrimeGrid mentioned at TEDx talk
Watch a TEDx Warwick talk by Francois Grey about citizen cyberscience, which also mentions PrimeGrid (at about 8:20) or download the video (215MB).<br /> $f("player", "/flowplayer/flowplayer-3.1.0.swf", { clip: { url: '/download/TEDx/francois_grey.flv', autoPlay: false } });
13 May 2009 | 18:15:00 UTC
· Comment
Mac OS X support!
We have released first PrimeGrid application for Mac OS X, Arithmetic Progression of 26 Primes Search (AP26). Mac OS X 10.3 running on PPC, 10.4 running on Intel and 64bit 10.5 running on Intel are supported.<br /><br /> Thanks to Iain Bethune for compiling the apps.
11 May 2009 | 9:00:00 UTC
· Comment
Record AP24 Found
PrimeGrid has found a record AP24 (Arithmetic Progression of 24 primes). It is the largest known AP24 as well as the AP24 with smallest known start. The finder is Andreas Kobara ([url=http://www.primegrid.com/show_user.php?userid= 20289]Lexs[/url]) of Germany. He is a member of the Gentoo Linux Users Everywhere team. The progression is written as 167806194923077+4935146*23#*n for n=0..23. It was found in the AP26 Search. For more details on this find and the AP26 search, please see this forum post.
6 May 2009 | 18:30:00 UTC
· Comment
50M Cobblestones
Congratulations to L'Alliance Francophone, for reaching the 50M cobblestones level at PrimeGrid. They are only the second team to accomplish this. It actually occurred during the Showers to Flowers Challenge so this is a bit belated. Again, congratulations!
5 May 2009 | 0:15:00 UTC
· Comment
The Showers to Flowers Challenge
The results are final. Over 1169T was crunched in the 48 hours of the Challenge and over 389,000 tasks were completed by 260 teams and 2092 individuals. Congratulations to SETI.Germany as the top team and [AF>XTBA>XTC] FRED as the top individual. Many thanks goes out to everyone who participated!!! For more stats and information, please see this forum post.
2 May 2009 | 14:00:00 UTC
· Comment
The Showers to Flowers Challenge
Let the "rains" begin!!! The Showers to Flowers Challenge has started. A 2 day (48 hour) Challenge is being offered on PrimeGrid's Prime Sierpinski Project (Sieve) application. For more information, please see this forum post.
29 Apr 2009 | 18:00:00 UTC
· Comment
The Showers to Flowers Challenge
Only 24 hours remain until it starts "raining" factors. A 2 day (48 hour) Challenge is being offered on PrimeGrid's Prime Sierpinski Project (Sieve) application. Come join us for a shower of factors in hopes to make those hidden primes bloom. :) For more information, please see this forum post.
28 Apr 2009 | 18:00:00 UTC
· Comment
World Record Cullen Mega Prime found
On 20 Apr 2009 0:52:45 UTC, PrimeGrid's Cullen Prime Search found a World Record Cullen Mega Prime: 6328548*26328548+1 The prime is PrimeGrid's largest prime to date. It is 1,905,090 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 14th overall. It is the largest Cullen prime found and the largest found Mega Prime using LLR. The discovery was made by Dennis R. Gesker (Gesker) of the United States using an Intel Xeon E5420 @ 2.50GHz with 8GB RAM running Windows Server 2008. This computer took 32 hours 28 minutes to complete the primality test. For more details, please see the official announcement. Decimal representation of the number is also available.
21 Apr 2009 | 2:10:00 UTC
· Comment
World Record Cullen Mega Prime found
A PrimeGrid participant has discovered a World Record Cullen Mega Prime in the Cullen Prime Search. This is a very special and rare find. It is only the 15th Cullen prime known. It is also a top 15 prime and the largest found by LLR. Additionally, it is PrimeGrid's largest prime to date. Stay tuned for more details.
20 Apr 2009 | 19:00:00 UTC
· Comment
Record AP25 Found
PrimeGrid has found a record AP25 (Arithmetic Progression of 25 primes). This is PrimeGrid's first AP25 and only the second known. It is the largest AP25 having an ending term of 15523154536267043 surpassing the old record of 8132758706802551. It is also the AP25 with smallest known start 2960886048458003, the previous record being 6171054912832631. The finder is BOINC@Poland's "Super Computer" (SKB@P). It is a farm of machines funded by BOINC@Poland members. The progression is written as 2960886048458003+2346233*23#*n for n=0..24. It was found in the AP26 Search. For more details on this find and the AP26 search, please see this forum post.
9 Apr 2009 | 16:15:00 UTC
· Comment
Record AP24 Found
PrimeGrid has found a record AP24 (Arithmetic Progression of 24 primes). It is the largest known AP24. It has an ending term of 19898154930924749 surpassing the old record of 19516877252820799. The finder is Pawel Stachowiak (stachu @ fiddex) of Poland. The progression is written as 7960592659339799+2326495*23#*n for n=0..23. It was found in the AP26 Search. For more details on this find and the AP26 search, please see this forum post.
7 Apr 2009 | 15:30:00 UTC
· Comment
New AP24 Found
PrimeGrid has found a "New" Arithmetic Progression of 24 primes. The finder is Pawel Stachowiak (stachu @ fiddex) of Poland. The progression is written as 6274259724784693+2522655*23#*n for n=0..23. It was found in the AP26 Search. We expect to find many more and even a few AP25's along the way to the goal of an AP26. For more details on this find and the AP26 search, please see this forum post.
5 Apr 2009 | 19:30:00 UTC
· Comment
321 Prime Search finds a Mega Prime
On 3 Apr 2009 15:40:01 UTC, PrimeGrid's 321 Prime Search found another Mega Prime:<br />3*25082306+1<br />The prime is 1,529,928 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 15th overall. It is the 6th largest Proth prime found and the largest found Mega Prime using LLR. The discovery was made by Andy Brady (Andy Brady) of the United States using an Intel C2Q Q8200 @ 2.33GHz with 3GB RAM running Windows Vista. This computer took about 14 hours 7 minutes to complete the primality test. Andy is a member of the BOINCstats team. <br />For more details, please see the official announcement. Decimal representation of the number is also available.
5 Apr 2009 | 7:20:00 UTC
· Comment
321 Prime Search finds a Mega Prime
A PrimeGrid participant has discovered a Mega Prime in the 321 Prime Search! We are currently GFN divisibility testing the prime as well as awaiting contact with the discoverer. It is a top 15 prime and the largest found by LLR. Stay tuned for more details.
4 Apr 2009 | 14:10:00 UTC
· Comment
Fermat Number Divisor
Congratulations to Eric Embling (Eric E) of the United States, the discoverer of PrimeGrid's third Fermat Number divisor in the Proth Prime Search project: 659*2^617815+1 Divides F(617813). It is the 3rd found Fermat Number divisor of 2009 and 273rd overall. It is the 6th largest Fermat Number divisor in Chris Caldwell's The Largest Known Primes Database. Incidentally, it is a new record for "weighted" Fermat Number divisors. For more information, please see this forum post.
2 Apr 2009 | 1:30:00 UTC
· Comment
New AP24 Found
PrimeGrid has found a "New" Arithmetic Progression of 24 primes. The finder is Krzysztof Koczubik (ksysju) of Poland. This is his second AP24 discovery. The progression is written as 6872932294461509+2042703*23#*n for n=0..23. It was found in the AP26 Search. We expect to find many more and even a few AP25's along the way to the goal of an AP26. For more details on this find and the AP26 search, please see this forum post.
28 Mar 2009 | 5:40:00 UTC
· Comment
The Ides of March Challenge
The results are final. Over 550,000 tasks were completed by 148 teams and 901 individuals. Congratulations to BOINCstats as the top team and j2satx as the top individual. Many thanks goes out to everyone who participated!!! For more stats and information, please see this forum post.
20 Mar 2009 | 4:50:00 UTC
· Comment
The Ides of March Challenge
The photo finish is in and it looks pretty clear that BOINCstats has taken the team standings and j2satx the individual standings (unofficial). What an incredible past 24 hours. Job well done everyone!!! Congratulations all around. As for the fate of the primes, you can still hear their sorrowful moans as they are hauled off to the Top 5000 list. More details to come.
16 Mar 2009 | 18:35:00 UTC
· Comment
The Ides of March Challenge
Just under 1 & 1/2 hours remain. So far, a week's worth of primes have been found in less than 24 hours...with more still coming in. The team and individual competitions are still battling it out. A photo finish seems inevitable. Now is the time to start preparing for the conclusion. Update your clients early and update often. For more information, please see this forum post.
16 Mar 2009 | 16:35:00 UTC
· Comment
The Ides of March Challenge
8 hours into the Challenge and the primes are beginning to fall. The start went exceptionally well with over 40K tasks going out in 30 minutes (11630 tasks in the first 5 minutes)!!! Well done everyone. The team and individual competitions are heating up with fierce battles going on for the top spots. Looks like it's shaping up for another "down to the wire" finish. For more information, please see this forum post.
16 Mar 2009 | 2:10:00 UTC
· Comment
The Ides of March Challenge
T-minus 18 hours and counting. The sievers have the primes on the run. The Ides of March approaches and doom is in the air for these primes. Come join us for a 24 hour Challenge on the Proth Prime Search LLR project. For more information, please see this forum post.
15 Mar 2009 | 0:00:00 UTC
· Comment
GCW13 Mini-Challenge
Friday the 13th has come and gone. Sadly, those elusive and unique GCW13 primes continue to elude us. Looks like Friday, November the 13th will get its chance at finding them. However, the results will be much different in just over a day and a half from now for The Ides of March Challenge. The question isn't will a prime be found...it's how many. In a tribute to the sievers, come join us for a 24 hour Challenge on the Proth Prime Search LLR project. For more information, please see this forum post.
14 Mar 2009 | 2:00:00 UTC
· Comment
GCW13 Mini-Challenge
Friday, March the 13th is HERE!!! And still no sighting of the elusive Generalized Cullen or Woodall base 13 primes. Will today be the day, or will we have to wait until Friday, November the 13th? Come join for a final push today. For more information, please see this forum post.
13 Mar 2009 | 1:25:00 UTC
· Comment
GCW13 Mini-Challenge
Friday, March the 13th, is approaching which means it's time for another "friendly" mini-challenge to find a Generalized Cullen or Woodall base 13 prime. As we discovered last time, this is no easy task. With St. Patrick's day around the corner, we'll need a little bit of that Irish Luck to come early. :) For more information, please see this forum post.
9 Mar 2009 | 4:05:00 UTC
· Comment
Fermat Number Divisor
Congratulations to Senji Yamashita (s-yama) of Japan, the discoverer of PrimeGrid's second Fermat Number divisor in the Proth Prime Search project: 519*2^567235+1 Divides Fermat F(567233). It is only the 2nd found Fermat Number divisor of 2009 and 272nd overall. It is the 7th largest Fermat Number divisor in Chris Caldwell's The Largest Known Primes Database. Incidentally, it is a new record for "weighted" Fermat Number divisors. For more information, please see this forum post.
7 Mar 2009 | 3:40:00 UTC
· Comment
New AP24 Found
PrimeGrid has found a "New" Arithmetic Progression of 24 primes. The finder is Stefan Smietanowski (Blast) of Sweden. The progression is written as 2725131905640097+1342336*23#*n for n=0..23. This was found in the AP26 Search. We expect to find many more and even a few AP25's along the way to the goal of an AP26. For more details on this find and the AP26 search, please see this forum post.
6 Mar 2009 | 23:10:00 UTC
· Comment
The Ides of March Challenge
The countdown has started, T minus 10 days and counting. The sievers are hard at work behind the scenes factoring out all the prime wannabe's. Doomsday is approaching the remaining candidates as there is little room left to hide. Come 15 March, GLORY will go to the finders and the primes will face their nemesis, the Top 5000 List at the Prime Pages. Be sure to catch some of that GLORY in the 24 hour Ides of March Challenge. For more information, please see this forum post.
5 Mar 2009 | 18:00:00 UTC
· Comment
Statically-linked LLR wrapper
The new LLR wrapper that was released two weeks ago has now been updated to be fully statically-linked. Testing has gone well in the Proth Prime Search project. Therefore, it has been released for all LLR projects which include 321 Prime Search, Cullen Prime Search, Prime Sierpinski Problem, Twin Prime Search, and the Woodall Prime Search. 32 bit Linux support continues on ALL LLR projects. Again, thanks to Geoff Reynolds who has made this build a reality!
3 Mar 2009 | 19:30:00 UTC
· Comment
BEWARE the Ides of March!!!
If you are a prime, BEWARE the Ides of March!!! Right now, 100's of sievers are working behind the scenes to clear the path for the primality testers to find you. And on 15 March, your time is up!!! A 24 hour Challenge is being offered on PrimeGrid's Proth Prime Search (LLR) application. For more information, please see this forum post.
2 Mar 2009 | 4:15:00 UTC
· Comment
Tour de Primes 2009 has ended!!!
There were no surprise sprints on this last day...just a nice champagne stroll around the Champs-Elysées. Congratulations to the jersey winners: Yellow - Lennart; Green - s-yama; and Checkered - Lennart. For more details on the conclusion of the race, please see this forum post.
1 Mar 2009 | 6:55:00 UTC
· Comment
New AP24 Found
PrimeGrid has found a "New" Arithmetic Progression of 24 primes. The finder is Krzysztof Koczubik of Poland. He is a member of BOINC@Poland. The progression is written as 13785500104035967+1004314*23#*n for n=0..23. This was found in the AP26 Search. We expect to find many more and even a few AP25's along the way to the goal of a record AP26. For more details on this find and the AP26 search, please see this forum post.
26 Feb 2009 | 17:45:00 UTC
· Comment
321 Sieve
The 321 Sieve has completed its manual effort and is now available in BOINC. Current depth is p=2P for 5M PrimeGrid preferences[/url]and select 321 Prime Search (Sieve). It's currently available for Linux64 and Windows32/64.
19 Feb 2009 | 0:45:00 UTC
· Comment
Tour de Primes 2009
Over half way through the Tour de Primes and Lennart continues to hold a comfortable lead. A quick look at his primes and you can see that he's taking advantage of PPSE on PRPNet. With the mountain stage coming up on the 23rd, it's not too late to reel him back in. For more information, please see Tour de Primes 2009. For information about PRPNet, please see this forum post.
18 Feb 2009 | 0:10:00 UTC
· Comment
New LLR Wrapper for Linux
A new LLR wrapper for Linux has been released. Along with this release, there is now Linux support for the Cullen Prime Search (LLR) and Prime Sierpinski Problem (LLR). A special thanks to Geoff Reynolds, who made this build a reality! For more information, please see this forum post.
17 Feb 2009 | 22:25:00 UTC
· Comment
12121 Prime Search
We are happy to announce that PrimeGrid is partnering with 12121 Search. Similar to 321 Search (k=3), 12121 Search is searching for single k primes of the form 121*2^n-1. They have been successfully searching since 2004 and are now in the Mega Prime area. For more details on the new search, please see this forum thread.
14 Feb 2009 | 4:10:00 UTC
· Comment
Prime Month
The prime month competition is starting to heat up. Lennart has just recently broken away from the group and has a 3 prime lead. He has a mixture of BOINC and PRPNet primes. Is there anyone who can challenge him for the yellow jersey??? Just under 2/3's of the month remains so there's plenty of time for someone to rein him back into the peloton. For more information, please see this forum post.
10 Feb 2009 | 1:45:00 UTC
· Comment
GCW13 Mini-Challenge
PrimeGrid user rogue has proposed a "friendly" mini-challenge to find a Generalized Cullen or Woodall base 13 prime on or before Friday, February 13th, 2009. A most ambitious endeavor! It will take the Luck of all the Irish PrimeGrid users for this prime to be found...especially on that date. However, to the finder goes all the spoils of fame (math fame) for these elusive gems! For more information, please see this forum thread.
9 Feb 2009 | 4:00:00 UTC
· Comment
50M Cobblestones
Congratulations to SETI.Germany, the first team to reach 50M cobblestones at PrimeGrid. Also, a special thanks to pschoefer, SETI.Germany's administrator at PrimeGrid, who does an excellent job managing PrimeGrid's information for such a large team. Now the race is on for 100M cobblestones...can it be reached by year's end??? and by which team??? :)
8 Feb 2009 | 6:15:00 UTC
· Comment
The Year of the Ox Challenge
While the Challenge is over, the Year of the Ox is just beginning. Over 18,000 321 WU's were completed by 133 teams and 589 individuals. Congratulations to BOINCstats as the top team and WilliamWallace as the top individual. It was a GREAT start to the 2009 Challenge Series. Congratulations to everyone and thank you for participating!!! For more information, please see this forum post.
31 Jan 2009 | 23:45:00 UTC
· Comment
The Year of the Ox Challenge
24 hours into the Year of the Ox Challenge and all is well. In just this short time, BOINCstats has taken a commanding lead while the individual competition is a bit closer. It's not too late to join the fireworks in a celebration of the Chinese New Year. For more information, please see this forum thread.
27 Jan 2009 | 21:45:00 UTC
· Comment
The Year of the Ox Challenge
Just over 24 hours remain until the Year of the Ox Challenge. Come join the fireworks in a celebration of the Chinese New Year, the Year of the Ox. A 5 day (26th-31st Jan) Challenge is scheduled on PrimeGrid's 321 Prime Search LLR application. For more information, please see this forum thread.
25 Jan 2009 | 15:15:00 UTC
· Comment
The Year of the Ox Challenge
PrimeGrid's 2009 Challenge Series starts off with a fire cracker bang! Please come join us in the Chinese New Year, the Year of the Ox, for a 5 day (120 hour - 26th-31st Jan) Challenge on PrimeGrid's 321 Prime Search (LLR) application. The Ox is the sign of prosperity through fortitude and hard work. It is unswervingly patient, tireless in its work, and capable of enduring any amount of hardship without complaint. Sounds a lot like prime searchers. :) For more information, please see this forum thread.
20 Jan 2009 | 19:45:00 UTC
· Comment
Norton Antivirus alarms
We are seeing multiple workunit failures and trouble reports because of Symantec (Norton) antivirus marking our screensaver as a probable virus. While there is nothing we can do about it, you can exclude BOINC data directory from antivirus path, and contact Symantec telling them about the false positive.<br /><br /> Please keep all discussions in this forum thread .
16 Jan 2009 | 15:00:00 UTC
· Comment
First prime of 2009
Congratulations to zed, the discoverer of PrimeGrid's first prime for 2009 in the Proth Prime Search project: 15*2^483098+1. Unfortunately, it was just a double check. The first "new" prime of 2009 was found by Vato, again from the Proth Prime Search project: 835*2^483718+1.
1 Jan 2009 | 15:55:00 UTC
· Comment
Fermat Divisor
Congratulations to Eric Ueda, the discoverer of PrimeGrid's first Fermat divisor in the Proth Prime Search project: 651*2^476632+1 Divides F(476624). It is only the 6th found Fermat divisor of 2008 and 270th overall. It is the 8th largest Fermat divisor in Chris Caldwell's The Largest Known Primes Database. For more information, please see this forum thread.
28 Dec 2008 | 18:45:00 UTC
· Comment
AP26 Search
PrimeGrid has added a new prime search project, an Arithmetic Progression of 26 primes. An arithmetic progression of primes is a sequence of primes with a common difference between any two successive numbers in the sequence. For example 3, 7, 11 is an arithmetic progression of 3 primes with a common difference of 4. To participate, go to your PrimeGrid preferences page and select AP26 (currently only available for 64 bit Linux). For more information, please see this forum thread.
27 Dec 2008 | 18:50:00 UTC
· Comment
Primorial Prime Search
PrimeGrid has added a new prime search project, the Primorial Prime Search. These primes are of the forms p#+1 and p#-1. It enters the Project Staging Area first as a manual sieving effort. Once sufficient depth has been reached, a primality testing effort will begin. For more information, please see this forum thread.
26 Dec 2008 | 7:00:00 UTC
· Comment
2008 Challenge Series
PrimeGrid's 2008 Challenge Series has concluded. Congratulations to SETI.Germany as the top team and lennart SM5YMT as the top individual. They are the winners to PrimeGrid's inaugural 2008 Challenge Series. For a list of other top finishers, please see this forum thread.
24 Dec 2008 | 15:40:00 UTC
· Comment
The Winter Solstice Challenge
The results are in for the Winter Solstice Challenge. Thank you for your patience. The margin of victory is 0.055%. Congratulations to WilliamWallace as the top individual and BOINCstats as the top team. For more information, please see this forum thread. The crowning of the top overall finishers in PrimeGrid's 2008 Challenge Series is next.
24 Dec 2008 | 1:10:00 UTC
· Comment
The Winter Solstice Challenge
The Solstice has come and gone. Twas a tough last 12 hours but we have survived the night and the sun has risen again! The Winter Solstice Challenge ended with a tremendous battle. It's still too close to call. Thank you to all who participated in what turned out to be PrimeGrid's top Challenge of the Year. It would not have been possible without your support. For more information, please see this forum thread. Stay tuned...final results will be coming soon.
22 Dec 2008 | 6:50:00 UTC
· Comment
The Winter Solstice Challenge
'tis but 12 hours left till the Solstice. The fire is burning bright and there's plenty of logs to keep it alit til the sun's return at dawn. :) The team and individual races are as tight as ever. It looks like this will go down to the wire. :) Thank you everyone for making this the most exciting Challenge yet. For more information, please see this forum thread.
21 Dec 2008 | 0:04:00 UTC
· Comment
The Winter Solstice Challenge
Only 24 hours remain until the Winter Solstice...the longest night/shortest day of the year. Although we are in the middle of winter in the northern hemisphere, the competition remains very hot...not to mention the heat coming off the cores. :) This is by far the most highly contested Challenge of the year. Most fitting for the finale in the 2008 Challenge series. For more information, please see this forum thread.
20 Dec 2008 | 12:04:00 UTC
· Comment
The Winter Solstice Challenge
Over 24 hours into the 4 day (96 hour) Challenge and all is well. Everything is going quite smooth right now. Another record breaking amount of work is being completed. There are some close races in both the team and individual categories. It's not too late to join in and give your favorite team a boost. :) For more information, please see this forum thread.
18 Dec 2008 | 18:50:00 UTC
· Comment
The Winter Solstice Challenge
Less than 24 hours remain till the Winter Solstice Challenge. Come join us in a 4 day (96 hour) Challenge on PrimeGrid's Prime Sierpinski Project (Sieve) application. Please consider running a few PSP (Sieve) WU's before the Challenge begins so your client will already have the sieve file. This way, during the Challenge, bandwidth can be used to deliver WU's instead of the sieve file. :) Thank you! For more information, please see this forum thread.
16 Dec 2008 | 15:10:00 UTC
· Comment
The Winter Solstice Challenge
PrimeGrid's Challenge series for 2008 ends with the Winter Solstice Challenge. Please come join us in observing Nature's ending/beginning of a cycle. A 4 day (96 hour) Challenge is being offered on PrimeGrid's Prime Sierpinski Project (Sieve) application. For more information, please see this forum thread.
10 Dec 2008 | 3:50:00 UTC
· Comment
The Prime Time Challenge (Exploded)
The database has finally started to recover from the Challenge...and we have finished licking our wounds. It was one heck of an initiation for the new server. The one positive outcome is that an incredible amount of work was completed (over 3.3M results in 48 hours). Again, the participation greatly exceeded our expectations. Congratulations to SETI.Germany as the top team and zeitgeistmovie.com as the top individual. One new prime was found by Fish. Thank you to all who participated and especially for your patience. We very much appreciate the support. For more stats and information, please see this forum thread.
7 Dec 2008 | 4:20:00 UTC
· Comment
The Prime Time Challenge (Reloaded)
Four and a half hours into the Prime Time Challenge (Reloaded) and all is well. After a few minor bumps at the start, everything seems to be going smoothly. Most definitely this is the highest activity PrimeGrid has ever seen. :) Finally a good initiation for the new server. Thank you to everyone participating. Now let's find some primes!!! For more information, please see this forum thread.
28 Nov 2008 | 22:30:00 UTC
· Comment
The Prime Time Challenge (Reloaded)
The pre-stress on the server to the Prime Time Challenge (Reloaded) has shown a substantial improvement. A few more adjustments should make things even better. Therefore, the Challenge is on for 28 Nov - 30 Nov. More information can be found in this forum thread.
27 Nov 2008 | 19:00:00 UTC
· Comment
The Proth Prime Search
The first new "reportable" primes have started to trickle in. Congratulations to Kai Strang for finding the first one 825*2^373331+1...just in time for the Prime Time Challenge (28 Nov - 30 Nov). Come join the Challenge and find a prime for yourself. For more information, please see this forum thread.
26 Nov 2008 | 15:45:00 UTC
· Comment
The Prime Time Challenge (Reloaded)
The Prime Time Challenge has been rescheduled for 28 Nov - 30 Nov. We would like to pre-stress the server on 27 Nov at 17:00 UTC. For more information, please see this forum thread.
24 Nov 2008 | 17:20:00 UTC
· Comment
The Prime Time Challenge
While the Challenge has been canceled (will be rescheduled) we will continue keeping stats for the current dates (14-16 November). The reason for this is that we want to continue to stress the server so we can see the impact on different server related issues. This will help us better prepare for the Prime Time Challenge (Reloaded). :) For those who are interested, please continue to crunch Proth Prime Search LLR through 16 Nov 2008 18:00 UTC. The results will be unofficial but the process will help us greatly. Thanks for the consideration and again, we apologize for the cancellation.
15 Nov 2008 | 17:15:00 UTC
· Comment
The Prime Time Challenge has been canceled. While the server is fine, we are having issues that we are not yet able to resolve. We sincerely apologize for this. More information to come when we have it.
14 Nov 2008 | 21:00:00 UTC
· Comment
The Prime Time Challenge
Less than 24 hours remain until the Prime Time Challenge (14-16 November 2008). The initiation process is already warming up as the load increases on the Proth Prime Search (LLR) in advance of the start. We are approaching the "reportable" level in Chris Caldwell's The Largest Known Primes Database! Come help us reach it and find a prime for yourself. For more information, please see this forum thread.
13 Nov 2008 | 18:00:00 UTC
· Comment
The Prime Time Challenge
Less than a week remains until the 48hr Prime Time Challenge (14-16 November 2008). Come help us initiate the new server and maybe find a prime large enough to enter into Chris Caldwell's The Largest Known Primes Database! The Challenge will highlight PrimeGrid's newest project, the Proth Prime Search. For more information, please see this forum thread.
9 Nov 2008 | 4:30:00 UTC
· Comment
Preparing for the Prime Time Challenge
The key to an effective prime search is having a good sieve file. For the past several months, our primary focus has been on getting the PPS Sieve deep enough to start LLRing. While we have made great strides in this effort, we still need more help. Leading up to this Challenge, anyone with a 64 bit multiple core system is encouraged to join the Proth Prime Search sieving effort. Please see this post if you are interested.
1 Nov 2008 | 3:30:00 UTC
· Comment
The Prime Time Challenge
PrimeGrid's Challenge series continues with the Prime Time Challenge (14-16 November 2008). It's high time we initiated the new server and what better way to do it than with a Challenge. Also, it's time to return to the thrill of finding primes...and for that, we turn to PrimeGrid's newest project, the Proth Prime Search. Currently, these tests are rather short so this will also give us a good opportunity to "stress" test and fine tune the new server. The Proth Prime Search is slowly working its way up to the "reportable" prime level in Chris Caldwell's The Largest Known Primes Database! So please come join us as we initiate the new server and bring the Proth Prime Search to the "reportable" prime level. For more information, please see this forum thread.
31 Oct 2008 | 4:00:00 UTC
· Comment
New server is live
While I'm writing these lines, the database is already running on the shiny new server in the new rack. While Murhpy has definitely played his role today, we hope that all troubles are gone and everything will be running smooth from now on.<br /><br /> The first minutes seem promising, and the speed has improved significantly. We'll keep you posted.<br /><br /> Big thanks for Willy for his work on the servers, and to all donators who helped make this server a reality!
27 Oct 2008 | 20:30:00 UTC
· Comment
Scheduled downtime - new server installation!
We are planning a scheduled downtime of several hours on Monday, October 27. We will be relocating PrimeGrid and BOINCstats servers to the new rack, and will add a new server for PrimeGrid, which has been purchased using funds from the recent donation drive.
23 Oct 2008 | 18:10:00 UTC
· Comment
"Optimal" sieve depth reached!
In a review yesterday of the Cullen/Woodall Project status, it was determined that we are at "optimal" sieve depth...actually, a little beyond it. Therefore, we are stopping the 32 bit and 64 bit Cullen/Woodall Sieve applications and archiving the sieve. Cullen/Woodall LLR will remain active up to n=10M. For more information, please see this forum post.
3 Oct 2008 | 16:50:00 UTC
· Comment
Planned outage
We have just received a notice that the datacenter where PrimeGrid and BOINCstats are located are going to do planned maintenance on the electrical grid that is powering everything, so we will have an outage starting 23:00UTC. The outage is planned to last at least 3 hours. Sorry for the inconvenience; you may wish to cache a little more work this evening.
1 Oct 2008 | 17:15:00 UTC
· Comment
10P milestone reached at PSP Sieve!
During the completion of the Challenge and in the excitement of reaching the funds for a new server, the Prime Sierpinski Problem Sieve entered into the 10P range. This was our "soft" goal for PrimeGrid's one year anniversary (13 October 2008). We reached it two weeks ahead of time. Congratulations everyone on this AMAZING accomplishment. For more information about the Prime Sierpinski Problem and next year's sieve goal, please see this forum post.
30 Sep 2008 | 15:05:00 UTC
· Comment
A new server is in PrimeGrid's future!
The Back to the Future Challenge has ended. Over 8000 Woodall WU's were completed by 204 teams and 1108 individuals. Congratulations to BOINCstats as the top team and lunarcom as the top individual. Also, thanks to the help of the anonymous donor as well as the hundreds of users who participated in the Challenge, we now have the funds to purchase a new server. For more stats and information, please see this forum post.
29 Sep 2008 | 3:00:00 UTC
· Comment
Message from Anonymous Donor
With just over half a day left in the Back to the Future Challenge, we have a solid green bar on the donation page. Congratulations everyone!!! The matching funds have come in as well as a message from the anonymous donor. A special thank you goes out to this individual for ensuring the continued growth of PrimeGrid. Best of Luck to everyone as this Challenge draws to an end.
27 Sep 2008 | 5:15:00 UTC
· Comment
The Back to the Future Challenge
Less than three days remain in the Back to the Future Challenge. There's still a battle for the top spot with BOINCstats holding off a fierce charge by the Canadians! :) Does either team have something up their sleeves for the last 72 hours? Only time will tell. Overall the Challenge is going well. We are almost to n=5.4M with a goal of 5.5M in sight. Additionally, donations are still being accepted for the new server. Currently, with the matching funds from the private donor, we have reached our goal. Any additional funds will go towards upgrading the server specs. A special thank you to everyone for helping out. Best of Luck in the next 72 hours.
24 Sep 2008 | 19:45:00 UTC
· Comment
The Back to the Future Challenge
Half way through and this is by far the most highly contested Challenge yet. Most surprisingly are the new teams and individuals atop the leader boards. A job well done by everyone. We are currently at the n=5.30M level with a goal of reaching 5.5M by the end. The Back to the Future Challenge has also made progress in donations for the new server. With seven days left, we have reached 52.8% of the funds needed. With the matching funds offer from the private donor, we need to reach at least 66.1%...the donor will complete the rest. One PrimeGrid user has started her own mini challenge, Krazy Kenzie's Server Challenge. She's just one donor away from success. :) Please check it out and see if you can help her make the "right" decision.
20 Sep 2008 | 18:00:00 UTC
· Comment
GIMPS set to claim $100,000 EFF award!!!
Congratulations to The Great Internet Mersenne Prime Search (GIMPS)! On August 23rd, a UCLA computer discovered the 45th known Mersenne prime, 2^43,112,609-1, a mammoth 12,978,189 digit number! The prime number qualifies for the Electronic Frontier Foundation $100,000 award for discovery of the first 10 million digit prime number. By the way, the second prime discovered less than two weeks later was also more than 10 million digits. It's the the 46th known Mersenne prime, 2^37,156,667-1, and comes in at 11,185,272 digits. For more information, please visit the GIMPS site.
16 Sep 2008 | 16:30:00 UTC
· Comment
45th and 46th Known Mersenne Primes Found!!!!
Congratulations to The Great Internet Mersenne Prime Search (GIMPS)! They have made extraordinary finds within two weeks of each other after going almost two years without a prime. We certainly marvel at this wonderful achievement. They are currently working on finding a suitable press outlet. More details will be announced early next week. The big question...is either one 10 million digits or more to claim the Electronic Frontier Foundation $100,000 award? :) For more information, please visit the GIMPS site. Again, congratulations!!!
12 Sep 2008 | 20:20:00 UTC
· Comment
The Back to the Future Challenge
Less than 24 hours till the Back to the Future Challenge. Please come join us as we journey back to PrimeGrid's most successful project so far, the Woodall Prime Search, to help us prepare for the future. A private donor has made an anonymous "matching funds" offer matching all donations 1:1 made from now through the Challenge (13 Sept 18:00 UTC to 27 Sept 18:00 UTC) up to the total amount needed for the new server. For more information, please see this forum thread.
12 Sep 2008 | 19:40:00 UTC
· Comment
The Back to the Future Challenge
PrimeGrid's Challenge series continues with the Back to the Future Challenge. We are very pleased and excited to announce that a private donor has made an anonymous "matching funds" offer. All donations made from now until the end of this Challenge (27 September) will be matched 1:1 (up to the total amount needed for the new server). Please come join us as we journey back to PrimeGrid's most successful project so far, the Woodall Prime Search, to help us prepare for the future. For more information, please see this forum thread.
6 Sep 2008 | 0:00:00 UTC
· Comment
Prime for 321 Prime Search
We are still awaiting contact with the pre-Challenge 321 Prime Search prime finder. If no contact is made soon, the prime will be transferred over to anonymous. PrimeGrid user, LadyHawk_A321, please contact project administrator at admin@primegrid.com as soon as possible.<br /><br /> For more information on the prime, please see this forum thread.
31 Aug 2008 | 6:00:00 UTC
· Comment
The Dog Days of Summer Challenge
Sirius has retreated to the horizon, but he refuses to go into the night sky without a prime. While the Challenge is over, the Dog Days remain...so let's put Sirius to sleep by finding that prime. It will take another 3-6 days for most results to be paired and declared valid. Therefore, Challenge rankings will not be finalized until then. The WU deadline was set to 3 days so unpaired results should be cleaned up quickly. For those who are interested in helping clean up these results, just leave your machines crunching 321 LLR for another 3 days. For up-to-date information, please see this forum thread.
25 Aug 2008 | 3:00:00 UTC
· Comment
The Dog Days of Summer Challenge
Less than 24 hours remain. Sirius refuses to go back to the night. The only thing that is known to work is by feeding him a prime. So let's find that prime and bring the Dog Days of Summer to an end. :D For more information, please see this forum thread.
24 Aug 2008 | 4:00:00 UTC
· Comment
Server down and back up
PrimeGrid server was inaccessible for about 30 minutes because the network at the datacenter where PrimeGrid and BOINCstats are hosted was down. The datacenter technicians seem to have brought the network back up, but we have no idea if it's going to stay up (the support phones of the hosting provider are down).<br /><br /> Update 18:11 UTC: it seems that the power was cut to the building; the servers were forcibly rebooted. I'm checking for stuck system processes now.<br /> Update 18:15 UTC: validator was stuck; it's fixed now. I think everything is running smooth now.
22 Aug 2008 | 17:55:00 UTC
· Comment
The Dog Days of Summer Challenge
Less than 24 hours till the Dog Days of Summer Challenge . For more information, please see this forum thread.
21 Aug 2008 | 2:00:00 UTC
· Comment
Prime for 321 Prime Search
The cooling rains have started early. In the run-up to the Dog Days of Summer Challenge, PrimeGrid's first 321 Prime Search prime has been discovered. Stay tuned for more details. UPDATE: 2008-08-18 We are still awaiting contact with prime finder.
16 Aug 2008 | 2:00:00 UTC
· Comment
The Dog Days of Summer Challenge
Look yonder in the hot summer sky and you can see the clouds building. A storm is brewing in the distance...a storm to end the Dog Days of Summer. Please come join us in a 3 day (22-24 August - 72 hour) Challenge to usher an end to the hot sweltering days of summer. PrimeGrid's 321 Prime Search LLR application has been chosen. For more information, please see this forum thread.
15 Aug 2008 | 1:00:00 UTC
· Comment
The Dog Days of Summer Challenge
PrimeGrid's Challenge series continues with the Dog Days of Summer Challenge. Please come join us in ushering an end to the hot sweltering days of summer. A 3 day (22-24 August - 72 hour) Challenge is being offered on PrimeGrid's 321 Prime Search LLR application. For more information, please see this forum thread.
8 Aug 2008 | 1:40:00 UTC
· Comment
Riesel Sieve project information
For those of you wondering what is the problem with Riesel Sieve, here is a word from BOINC side administrator Bryan:<br /> <blockquote>Basically, the project creator has disappeared. People have been in contact with him, but we haven't heard any resumption date or even if things will resume. For the time being, I'm focusing my efforts on getting the non-BOINC side of the project up, as it is far easier and requires far less resources. We do not have access to any of the databases or we would have been able to restore things even without the project creator.</blockquote><br /> Our wishes for RS to return as soon as possible.
31 Jul 2008 | 16:00:00 UTC
· Comment
PSP finds Mega Prime
The Prime Sierpinski Project has discovered their second mega prime: 258317*2^5450519+1. It is 1640776 digits long and will rank as the 12th largest known prime. The project has now found 17 primes total. There are only 12 primes left to solve the Prime Sierpinski Problem. For more information, please see this forum post.
27 Jul 2008 | 20:00:00 UTC
· Comment
Back online
Database has been recovered, please read a lengthy explanation in this forum thread.
22 Jul 2008 | 6:20:00 UTC
· Comment
Database issues
We are having database issues...stay tuned for more information.
21 Jul 2008 | 21:00:00 UTC
· Comment
The Lunar Landing Challenge
"Houston, Tranquility Base here. The Eagle has landed." The Lunar Landing Challenge is over. Over 525,000 WU's were completed by 193 teams and 1331 individuals. Congratulations to SETI.Germany as the top team and Banshee as the top individual. For more stats and information, please see this forum post.
21 Jul 2008 | 14:45:00 UTC
· Comment
The Lunar Landing Challenge
T-plus 24 hours after liftoff and all systems are nominal. :) The start severely stressed the vehicle, but it eventually made it into orbit. 48 hours remain until the Lunar Landing. For more information, please see this forum thread.
19 Jul 2008 | 0:00:00 UTC
· Comment
The Lunar Landing Challenge
T-minus 10 hours till liftoff and all systems are go. A 3 day (18-20 July - 72 hour) Lunar Landing Challenge is being offered on PrimeGrid's Prime Sierpinski Project sieve application. For more information, please see this forum thread.
17 Jul 2008 | 14:00:00 UTC
· Comment
The Lunar Landing Challenge
T-minus 3 days and counting. Unlike NASA, there are no holds in this countdown! :) Please come join us in commemorating the 39th Anniversary of the lunar landing by Apollo 11. A 3 day (18-20 July - 72 hour) Lunar Landing Challenge is being offered on PrimeGrid's Prime Sierpinski Project sieve application. For more information, please see this forum thread.
15 Jul 2008 | 0:00:00 UTC
· Comment
WU's lengthened
PrimeGrid is experiencing an increase in activity. In order to minimize the database AND to prepare for the upcoming Lunar Landing Challenge, sieve WU's have been lengthened. Credit has been adjusted accordingly. For more information, please see this post.
14 Jul 2008 | 6:00:00 UTC
· Comment
Database issues
We are having database issues, stay tuned for more information.<br /> Update 5:38 UTC: the database has been brought back online.
10 Jul 2008 | 5:25:00 UTC
· Comment
Server software upgrade
[edit] Upgrade completed way ahead of schedule at 11:40 UTC.<br /><br /> I am upgrading server software, so the project is offline. Estimated time of upgrade completion - 13:00 UTC. After the upgrade is completed, I will update this newspost.<br /><br /> Post any issues you think may be caused by the upgrade to this thread.
7 Jul 2008 | 11:15:00 UTC
· Comment
The Lunar Landing Challenge
PrimeGrid's Challenge series continues with the Lunar Landing Challenge. Please come join us in commemorating the 39th Anniversary of the lunar landing by Apollo 11. A 3 day (18-20 July - 72 hour) Challenge is being offered on PrimeGrid's Prime Sierpinski Project sieve application. For more information, please see this forum thread.
6 Jul 2008 | 14:00:00 UTC
· Comment
3*2^n-1 switched to +1
We've switched 3*2^n-1 subproject, which has been completed to n=5M and had no more work, to 3*2^n+1. The tasks are significantly shorter now (in the range of minutes), but it will change quite rapidly as we progress through the test space.
29 Jun 2008 | 19:20:00 UTC
· Comment
PrimeGrid's Birthday Challenge
The Birthday Party is over and all the candles have been blown out. Over 200,000 WU's were completed by 84 teams and 374 individuals. Congratulations to L'Alliance Francophone as the top team and Banshee as the top individual. For more stats and information, please see this forum post page.
13 Jun 2008 | 3:00:00 UTC
· Comment
PrimeGrid's Birthday Challenge
Less than a day remains until the Birthday Challenge begins. We are celebrating PrimeGrid's 3rd Birthday with a 24 hour Challenge on the Twin Prime Search. Please check your local time zones to determine your exact Challenge time: 12 June 2008 00:00 UTC to 13 June 2008 00:00 UTC. For more information, please see this forum thread.
11 Jun 2008 | 3:30:00 UTC
· Comment
PrimeGrid's Birthday Challenge
PrimeGrid's Challenge series continues with the Birthday Challenge. Please come join us in celebrating PrimeGrid's 3rd Birthday. A 24 hour Challenge is being offered on PrimeGrid's oldest active application, the Twin Prime Search. Hopefully we'll be able to give PrimeGrid a good present by finding the twin during the Challenge. :) For more information, please see this forum thread.
7 Jun 2008 | 14:15:00 UTC
· Comment
The Drive for Five Challenge
The Checkered flag is out...and The Drive for Five Challenge has ended. 22512 WU's were completed by 255 teams and 1681 individuals. Congratulations to L'Alliance Francophone as the top team and Banshee as the top individual. Remember, the top 40 places earn points for this Challenge. For more stats and information, please see this forum post page.
1 Jun 2008 | 14:00:00 UTC
· Comment
The Drive for Five Challenge
Less than 48 hours remain in the Challenge. For teams, places 1-4 are pretty much wrapped up. However, there is a tight 3-way battle for 5th place and several others beyond that. For individuals, there are many tight races below the top 3. Remember, due to the length of the Challenge, places 1-40 will earn Challenge Points this time. For more information, please see the Challenge Series page.
30 May 2008 | 1:30:00 UTC
· Comment
The Drive for Five Challenge
Half way through the Challenge...and although an incredible amount of work has been accomplished, the numbers have the upper hand right now. 13020 WU's have been completed but 16036 remain. Our goal is still to reach n=5M. Therefore, we are hosting a sprint this weekend to see if we can get back even or maybe ahead of where we need to be in order to reach 5M by the end of 31 May. For more information, please see this forum post.
23 May 2008 | 12:00:00 UTC
· Comment
The Drive for Five Challenge
24 hours into the Challenge and all is going well. 2100 WU's have been sent out and 26956 remain. Stats and more information can be found in this forum thread.
16 May 2008 | 0:30:00 UTC
· Comment
The Drive for Five Challenge
Only 24 hours remain until The Drive for Five Challenge begins. Please check your local time zones to determine the start of the challenge: 15 May 2008 00:00 UTC. For more information, please see this forum thread.
14 May 2008 | 0:00:00 UTC
· Comment
Updated application for TPS subproject - now has a screensaver!
New application version for TPS subproject has been released. If it behaves correctly, I will release it for other subprojects.<br /> For the first time, it also features a screensaver!
11 May 2008 | 14:10:00 UTC
· Comment
The Drive for Five Challenge
PrimeGrid's Challenge series continues. Please come join our effort to reach n=5 million in the 321 Prime Search (3*2^n-1). The Challenge will begin 00:00 UTC, 15 May 2008. For more information, please see this forum thread.
9 May 2008 | 1:40:00 UTC
· Comment
Problems saving preferences
We are aware of the issues saving your preferences (the message states that the changes have been saved, which doesn't actually happen), and are working to resolve the issue. It has been reported that logging out and in again helps, so you might try that as a workaround.<br /> UPDATE: as of 16:00 UTC preferences saving should work.
7 May 2008 | 15:45:00 UTC
· Comment
Sieve WU lengths increased
In an attempt to lower the size of the database, we have increased the WU length to both the PSP Sieve and GCW Sieve projects. WU's are now 1.5X as long...so a 6 minute WU now takes 9 minutes. Credit has been adjusted accordingly.
30 Apr 2008 | 13:55:00 UTC
· Comment
Workunit deadlines increased
The deadlines for subprojects that have very long workunits have been increased to 12 days. The subprojects affected are Woodall Prime Search, Cullen Prime Search, 321 Prime Search and Prime Sierpinski Project (all LLR).
26 Apr 2008 | 17:00:00 UTC
· Comment
Standalone screensaver application published for testing
Nicolas has posted a standalone PrimeGrid screensaver application which is going to be included within the next science application update. We are looking for people to try it out on their computers so that we know it runs fine before we publish it project-wide.<br /><br /> Visit the thread in the forums to find more about it.
23 Apr 2008 | 20:00:00 UTC
· Comment
Can you survive for 24 hours without your computer?
 <br /> It is obvious that without computers we would find our life extremely difficult, maybe even impossible. If they disappeared for just one day, would we be able to cope?<br /><br /> Be part of one of the biggest global experiments ever to take place on the Internet. The idea behind Shutdown Day is to find out how many people can go without a computer for one whole day, and what will happen if we all participate!<br /><br /> Shutdown your computer on 03 May 2008 and find out! Visit shutdownday.org and join the campaign!<br /><br /> (And before you ask - no, PrimeGrid server isn't going down on that day)
23 Apr 2008 | 11:00:00 UTC
· Comment
Mega Prime for 321 Search
On 23 Mar 2008 7:57:28 UTC, PrimeGrid, in collaboration with 321 Search, found another Mega Prime:<br /> 3*24235414-1<br /> The prime is 1,274,988 digits long and enters The Largest Known Primes Database ranked 14th overall. This is 321 Search's first mega prime and 11th prime overall. It is the second largest found mega-digit prime using LLR.<br /> The discovery was made by Dylan Bennett of Canada using an Intel C2D @ 1.66 GHz with 2GB RAM. This computer took almost 15 hours and 30 minutes to complete the primality test.<br /> For more details, please see the official announcement. Decimal representation of the number is also available.
18 Apr 2008 | 15:05:00 UTC
· Comment
Mega Prime for 321 Search
A PrimeGrid participant has discovered a Mega Prime for the 321 Search project. Stay tuned for more details.
17 Apr 2008 | 1:40:00 UTC
· Comment
Updated statistics for prime finders
We have released an updated prime finder statistics page, which now counts primes find in all subprojects. The prime numbers are assigned a score which differs according to prime number size, so a giant Woodall prime is "worth" more than a smaller TPS prime. <br />The next step in improving statistics is to show the participants all the primes that have been found, which isn't yet available in the current version, but is coming soon.
14 Apr 2008 | 18:30:00 UTC
· Comment
Project Staging Area
After two months of testing, the Project Staging Area is officially open. This area was established to help prepare future projects for entry into PrimeGrid BOINC. It also offers a sneak peak into these projects by allowing users a chance to crunch them ahead of time. For more information, please see this forum thread.
14 Apr 2008 | 14:00:00 UTC
· Comment
PSP finds Mega Prime
The Prime Sierpinski Project has discovered their first mega prime: 265711*2^4858008+1 (1462412 digits long). The project has now found 16 primes total. There are only 13 primes left to solve the Prime Sierpinski Problem. For more information, please see this forum thread.
10 Apr 2008 | 17:40:00 UTC
· Comment
Up and running again
We are back up and running. For a detailed explanation of the events that caused the outage, please see the forum thread.
26 Mar 2008 | 19:00:00 UTC
· Comment
PrimeGrid Database Issues
The aftermath of the Ides of March Challenge has taken its toll as the database has been experiencing issues since 20 March 2008. Conditions are slowly starting to improve. For more information, please see this forum thread.
22 Mar 2008 | 18:15:00 UTC
· Comment
The Ides of March Challenge is Complete
Congratulations everyone on a job well done. The participation was well beyond our expectations. We exceeded our initial goal of 50K WU's and our advanced goal of 250K WU's downloaded. Additionally, we completed well beyond the sieve depth of p=2500T so a GREAT milestone for the Prime Sierpinski project and Seventeen or Bust. For more details on results, please see this forum post.
16 Mar 2008 | 4:00:00 UTC
· Comment
The Ides of March Challenge Update
First 12 hours of the challenge have gone well! 186.1K WU's have been downloaded so far. Our original goal was 50K and that was hit 1 hour 35 minutes into the Challenge. Quite AMAZING!!! For an updated status, please see this forum post.
15 Mar 2008 | 12:00:00 UTC
· Comment
The Ides of March Challenge Update
Less than 10 hours until the Ides of March. There has been an unprecedented run-up before the Challenge. We can sense the impending doom for 1000's of k/n pairs. For updated information, please see the forum thread.
14 Mar 2008 | 14:00:00 UTC
· Comment
The Ides of March Challenge Update
Only 3 days remain until the Ides of March. Please check you local time zones to determine the start of the challenge: 15 March 2008 00:00 UTC. For updated information, please see the forum thread.
12 Mar 2008 | 15:00:00 UTC
· Comment
The Ides of March Challenge
With the Ides of March just a week away, we wish to offer a challenge. Come join a one day effort in an attempt to push the Prime Sierpinski Sieve to over 50,000 WU's in one day and thus reach the p=2500T sieve depth. For more information, please see the forum thread.
8 Mar 2008 | 14:15:00 UTC
· Comment
64bit Linux sr2sieve
A 64bit Linux sr2sieve application has been released for the Prime Sierpinski Problem sieve. For more information, please see the forum post.
2 Mar 2008 | 15:00:00 UTC
· Comment
Upcoming Projects
PrimeGrid will soon be offering three new projects. For more information about these and future considerations, please see the forum thread.
27 Feb 2008 | 5:30:00 UTC
· Comment
Problems with 64bit Windows PSP Sieve fixed
Version 1.04 of PSP Sieve application has been released, fixing the issue with 64bit Windows hosts.
20 Feb 2008 | 18:30:00 UTC
· Comment
Problems with 64bit Windows PSP sieve application
We have temporarily disabled 64bit Windows PSP Sieve application because it was crashing and locking up BOINC client. We are investigating the cause for that; for now 32bit application will be sent instead.
19 Feb 2008 | 13:15:00 UTC
· Comment
64bit Linux gcwsieve
I know some of you were eagerly awaiting this. Well, the time has come - we now started testing 64bit Linux gcwsieve application. For more information, see the forum thread.
18 Feb 2008 | 10:15:00 UTC
· Comment
End of the life cycle of primegen application
We are inserting the final batches of work for our oldest available application, primegen. While primegen has proved to be very useful in the early project stages for infrastructure testing, it has served it's purpose and it's time to make way for newer, more efficient applications. Once the final batches are completed the cleanup will be executed, finally removing old stuck workunits. <br /><br /> We suggest participants running primegen exclusively also select an additional subproject for future processing. Sieve subprojects are very similar to primegen in size, so it is probably a good choice. Once there are no more primegen work to send, we will update project for such participants to select sieve subprojects.
15 Feb 2008 | 15:23:00 UTC
· Comment
Unscheduled outage
PrimeGrid is down for a moment, because workunit table has crashed; the repair process is running right now. Thanks to Lennart from Sweden who called me on the phone and told about the problem.<br /> Update 14:22 UTC: We're back up.
31 Jan 2008 | 14:15:00 UTC
· Comment
TPS work available again
Twin prime search work is available again (we had a few days outage for this subproject because work supply went dry).
10 Jan 2008 | 8:15:00 UTC
· Comment
Record breaking Woodall prime
On 21 Dec 2007, 10:09:30 UTC, PrimeGrid's Woodall Prime Search found the 33rd and largest known to date Woodall prime:<br /> 3752948*23752948-1<br /> The prime is 1,129,757 digits long and enters The Largest Known Primes Database ranked 1st for Woodall primes and 13th overall. It's the first found mega-digit prime using LLR.<br /> The discovery was made by Matthew J. Thompson of the United States using an Intel P4 @ 2.8 GHz with 512MB RAM. This computer took almost 15 hours and 11 minutes to complete the primality test.
29 Dec 2007 | 21:05:00 UTC
· Comment
1 million digit prime
A user of PrimeGrid has discovered a Woodall prime which is over 1 million digits long. It is the biggest Woodall prime ever discovered, and 13th biggest known prime of any kind. Stay tuned for more details.
28 Dec 2007 | 20:30:00 UTC
· Comment
Code upgrade
Server backend code has been upgraded, the option to decline team founder transfer now works. If you notice any errors (no, dozens of buttons in the forum is not an error), please post in the forums or use the contact link available in every page in the very bottom.
16 Dec 2007 | 15:30:00 UTC
· Comment
Scheduled downtime
During the night of December 14/15 (Europe time) PrimeGrid server will be down because of scheduled maintenance in the datacenter where PrimeGrid and BOINCstats are hosted. The downtime is needed to upgrade power infrastructure, because currently there isn't enough backup power (UPS) to run all the servers in case of a power outage.
9 Dec 2007 | 16:00:00 UTC
· Comment
New subproject available
We have released the LLR application for the 321 Search. 321 is attempting to find a mega prime in the form 3*2^n-1. The 4+ year old project currently holds the largest non-GIMPS/non-Seventeen or Bust prime.<br /> As usual, you can choose to crunch work for this project by visiting your project preferences page. Supported platforms: 32bit Linux & Windows.
5 Dec 2007 | 17:45:00 UTC
· Comment
Unexpected outage (resolved)
Results table has crashed, the project is offline while we recover data.<br /> Update: the issue has been resolved at 8:57 UTC.
5 Dec 2007 | 8:13:00 UTC
· Comment
Automatic reporting to the Prime Pages available
From now on you can give permission to PrimeGrid to report the primes you find to the Prime Pages on your behalf. To do this, go to the project preferences page and enter your data.
30 Oct 2007 | 9:45:00 UTC
· Comment
Backend code upgrade
The backend code has been upgraded. There were some issues related to the web code, but they seem to be fixed. If you find any problems that I missed, please post in the forums.
27 Oct 2007 | 20:00:00 UTC
· Comment
Linux LLR available!
Good news for Linux lovers - with the help from our user Der Meister we have released 32bit Linux LLR application for Twin Prime Search project. If it goes well, it will be released for Cullen/Woodall Prime Search, too. The 32bit application is also being sent to 64bit hosts.
14 Oct 2007 | 12:15:00 UTC
· Comment
Prime Sierpinski Project sieve available
We have released Sieve application for Prime Sierpinski Project. It is trying to solve the Prime Sierpinski Problem. Windows 32bit and 64bit versions are supported. As usual, you can choose to crunch work for this project by visiting your project preferences page.
13 Oct 2007 | 14:15:00 UTC
· Comment
LLR Cullen percentage reporting bug fixed
Thanks to Bryan from Riesel Sieve, the Cullen workunit progress reporting bug has been fixed. The workunits running application version 5.08 should correctly display feedback during processing.
30 Sep 2007 | 16:15:00 UTC
· Comment
64bit sieving application available
A 64bit Windows version of GCW sieve application has been released. It improves speed twice comparing to 32bit version. The new application is automatically sent to hosts running 64bit version of BOINC that have sieving subproject enabled in the project preferences.
29 Sep 2007 | 15:30:00 UTC
· Comment
Cullen/Woodall Sieve available
We have released a sieving app for Cullen/Woodall Prime Search. Sieving will help to greatly reduce the amount of probable primes, therefore speeding up the actual prime search. You can choose to run sieve application by visiting project preferences page; please have in mind that the application has just been released, so it may have bugs or issues (although we haven't noticed any).<br /> Supported platforms: Windows 2000/XP/2003/Vista.
15 Sep 2007 | 18:35:00 UTC
· Comment
Record Woodall prime number found... again!
On 20 Aug 2007, 2:40:57 UTC, PrimeGrid's servers returned a positive result in the Woodall Prime Search. It was the double check validating that a Woodall prime was found on 13 Aug 2007, 1:42:08 UTC. 2367906*22367906-1 This is the 32nd and largest known to date Woodall prime. It is 712818 digits long and enters The Largest Known Primes Database (http://primes.utm.edu/primes/) ranked 1st for Woodall primes and 25th overall.<br /><br /> The discovery was made by Stephen Kohlman of Canada using an Intel C2D 6300 @ 1.86 GHz with 1 GB RAM. This computer took a little over 5 hours and 41 minutes to test using the LLR program. Stephen is a member of Canada team.
3 Sep 2007 | 15:00:00 UTC
· Comment
Leaving to Geneva
I will be leaving to Geneva for BOINC Workshop early tomorrow morning. This means that the project will have to run unattended for almost a week (I will of course monitor the server, but my time will be limited, so don't expect quick fixes if something dies).
3 Sep 2007 | 7:25:00 UTC
· Comment
Message to participant "Owner"
Message to project participant known as "Owner" or "big steve": please contact project administrator at admin@primegrid.com. Your computer has made a significant discovery, and we want to know your details before we publicize it.
25 Aug 2007 | 15:15:00 UTC
· Comment
Network maintenance
Tonight at 0:00UTC network maintenance will be performed in the datacenter where PrimeGrid server is hosted. The maintenance is planned to last approximately 30 minutes, during it the access to the project might be slow or unavailable. Sorry for the inconvenience.
19 Aug 2007 | 16:30:00 UTC
· Comment
Record Woodall prime number found
On 7 Aug 2007, 15:25:07 UTC, PrimeGrid's servers returned a positive result in the Woodall Prime Search. It was the double check validating that a Woodall prime was found on 4 Aug 2007, 19:36:57 UTC.<br /> 2013992*22013992-1 The prime is 606279 digits long and enters The Largest Known Primes Database (http://primes.utm.edu/primes/) ranked 1st for Woodall primes and 37th overall.<br /><br /> The discovery was made by Lasse Mejling Andersen of Denmark using an Intel Celeron 2.80 GHz with 512 MB RAM. This machine took a little over 3 hours and 27 minutes to test using the LLR program.<br /><br /> For more details, please see here.
9 Aug 2007 | 18:00:00 UTC
· Comment
Biggest ever Woodall prime discovered!
A few minutes ago PrimeGrid validated a workunit that had discovered the biggest Woodall prime ever discovered. More information will follow up later.
8 Aug 2007 | 5:56:00 UTC
· Comment
Validation suspended
Validation of returned results may be slow or even temporarily suspended while we sort the problems that appeared because of software upgrade. All credit will be granted, no work is lost.
6 Aug 2007 | 12:20:00 UTC
· Comment
Statistics moved
Stats sites should update references to PrimeGrid stats - filenames have changed because of recent code update.
4 Aug 2007 | 19:30:00 UTC
· Comment
Maintenance extended
The maintenance has been extended because of issues getting new work.
3 Aug 2007 | 21:30:00 UTC
· Comment
Shutdown for maintenance
PrimeGrid will be shut down for major software upgrade on August 3rd, 15:00UTC. The outage will last at least 4 hours, but may well be extended up to 48 hours.
2 Aug 2007 | 14:59:05 UTC
· Comment
New subproject added
We have added a new prime search project, Cullen/Woodall prime search. These primes are of forms n*2n+1 and n*2n-1 respectively. Our goal is to find the biggest Cullen and Woodall primes ever. This isn't as easy as it may sound, only 14 Cullen primes and 30 Woodall primes have ever been found, however, we believe that PrimeGrid has sufficient computing power to make this search plausible.<br /><br /> It is now possible to choose the subprojects you would like to run in project preferences page. Please note that when you are using account managers your choice may be reset when changing resource share allocation.
3 Jul 2007 | 17:16:20 UTC
· Comment
Twin Prime Search progress
Our user Terminal has been collecting statistics about our progress in the current Twin Prime Search project. Please see this thread for more information.
15 Jun 2007 | 14:02:48 UTC
· Comment
10 million workunits sent
Today marks the day when 10 millionth workunit was issued in the project. While this is nothing more than a simple numeric milestone, it is a really nice number to reach in the project that is all about numbers.<br /><br /> The workunit was crunched by the computer owned by user Strelnieks. Congratulations!
6 Jun 2007 | 17:39:59 UTC
· Comment
News is available as an RSS feed  |
