PrimeGrid
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1) Message boards : News : GFN 20 Found! (Message 156998)
Posted 15 days ago by ReggieProject donor
On 9 August 2022, 11:56:02 UTC, PrimeGrid’s Generalized Fermat Prime Search found the Generalized Fermat mega prime:

1951734^1048576+1

The prime is 6,595,985 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 1st for Generalized Fermat primes and 13th overall. This is the second-largest prime found by PrimeGrid, and the second-largest non-Mersenne prime.

The discovery was made by Kazuya Tanaka (apophise@jisaku) of Japan using an NVIDIA GeForce RTX 3080 Ti in an Intel(R) Core(TM) i7-9700K CPU @ 3.60GHz with 64GB RAM, running Microsoft Windows 10 Professional x64 Edition. This GPU took about 1 hour, 2 minutes to complete the probable prime (PRP) test using GeneferOCL5. Kazuya Tanaka is a member of Team 2ch.

The prime was verified on 10 August 2022, 17:39:14 UTC by Jens Katzur (Landjunge) of Germany using an NVIDIA GeForce RTX 3070 in an Intel(R) Xeon(R) CPU X5675 @ 3.07GHz with 40GB RAM, running Linux Ubuntu. This computer took about 1 hour, 36 minutes to complete the probable prime (PRP) test using GeneferOCL5. Jens Katzur is a member of Planet 3DNow!.

The PRP was confirmed prime on 11 August 2022 by an AMD Ryzen 9 5950X @3.4GHz, running Linux Mint. This computer took about 51 hours, 52 minutes to complete the primality test using LLR2.

For more details, please see the official announcement.
2) Message boards : Project Staging Area : prpnet stats sites appear to be down? (Message 156833)
Posted 35 days ago by ReggieProject donor
They're both up for me. It was either a temporary issue on our end, or it's an issue on your end somewhere.

I think I vaguely remember seeing PR_END_OF_FILE_ERROR on other sites a while ago. Restarting my router fixed it back then.
3) Message boards : AP26 - AP27 Search : New APs (Message 156699)
Posted 54 days ago by ReggieProject donor
New AP26!!!

A new AP26 (Arithmetic Progression of 26 primes) has been found. The finder is Hans-Jürgen Bergelt (hans-jürgen [bergelt]). Hans-Jürgen Bergelt is a member of the Bundesstaat Kgr. Sachsen team.

The AP26 was returned on the 17th of July 2022 08:23:04 UTC. It was found by an NVIDIA GeForce RTX 2080 Ti on an Intel(R) Core(TM) i9-9900KS CPU @ 4.00GHz Processor running Microsoft Windows 10 Professional x64 Edition. It took about 7 minutes and 49 seconds to process the task (each task tests 100 progression differences of 10 shifts each).

The AP26 task was double checked by Rusty Clark (Gator 1-3) of the United States and was returned on the 17th of July 2022 08:28:30 UTC. This task was run on an NVIDIA GeForce GTX 1060 3GB on an AMD Athlon(tm) II X2 250u Processor running Microsoft Windows 10 Education x64 Edition. The double check took about 44 minutes and 49 seconds to complete.

The progression is written as 36621451562941339+267460371*23#*n for n=0..25. Credits are as follows:

Finder: Hans-Jürgen Bergelt
Project: PrimeGrid
Program: AP26

The original AP26 CPU program was written by Jaroslaw Wroblewski and adapted to BOINC by Geoff Reynolds, and the GPU program was written by Bryan Little and Gerrit Slomma.
The 2016 CPU and OpenCL versions of AP26 were updated by Bryan Little, Iain Bethune, and Sebastian Jaworowicz.

All application builds by Bryan Little and Iain Bethune

The AP26 will be listed in Jens Kruse Andersen's Primes in Arithmetic Progression Records page under the section(s):


Congratulations!

Additional AP Information
How to search for 26 primes in arithmetic progression? by Jaroslaw Wroblewski
Primes in arithmetic progression - Wikipedia
Prime Arithmetic Progression - Wolfram MathWorld
Arithmetic sequence - The Prime Glossary at the Prime Pages

The 26 terms of the AP26
36621451562941339+267460371*23#*n for n=0..25

23#=2*3*5*7*11*13*17*19*23=223092870

36621451562941339+267460371*223092870*0=36621451562941339
36621451562941339+267460371*223092870*1=96289953340596109
36621451562941339+267460371*223092870*2=155958455118250879
36621451562941339+267460371*223092870*3=215626956895905649
36621451562941339+267460371*223092870*4=275295458673560419
36621451562941339+267460371*223092870*5=334963960451215189
36621451562941339+267460371*223092870*6=394632462228869959
36621451562941339+267460371*223092870*7=454300964006524729
36621451562941339+267460371*223092870*8=513969465784179499
36621451562941339+267460371*223092870*9=573637967561834269
36621451562941339+267460371*223092870*10=633306469339489039
36621451562941339+267460371*223092870*11=692974971117143809
36621451562941339+267460371*223092870*12=752643472894798579
36621451562941339+267460371*223092870*13=812311974672453349
36621451562941339+267460371*223092870*14=871980476450108119
36621451562941339+267460371*223092870*15=931648978227762889
36621451562941339+267460371*223092870*16=991317480005417659
36621451562941339+267460371*223092870*17=1050985981783072429
36621451562941339+267460371*223092870*18=1110654483560727199
36621451562941339+267460371*223092870*19=1170322985338381969
36621451562941339+267460371*223092870*20=1229991487116036739
36621451562941339+267460371*223092870*21=1289659988893691509
36621451562941339+267460371*223092870*22=1349328490671346279
36621451562941339+267460371*223092870*23=1408996992449001049
36621451562941339+267460371*223092870*24=1468665494226655819
36621451562941339+267460371*223092870*25=1528333996004310589

4) Message boards : Generalized Fermat Prime Search : High CPU usage (Message 156327)
Posted 79 days ago by ReggieProject donor
Probably solved with libsleep.
5) Message boards : Number crunching : Geek Pride Day Challenge (Message 155621)
Posted 129 days ago by ReggieProject donor
Last few posts are getting off topic folks... Consider this a warning before I start removing things.
6) Message boards : News : GFN 19 Found! (Message 155564)
Posted 132 days ago by ReggieProject donor
On 15 May 2022, 17:29:48 UTC, PrimeGrid's Generalized Fermat Prime Search found the Mega Prime:

4896418^524288+1

The prime is 3,507,424 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 3rd for Generalized Fermat primes and 54th overall.

The discovery was made by Tom Greer (tng) of the United States using a GeForce RTX 3060 in an Intel(R) Core(TM) i7-6700 CPU @ 3.40GHz with 24GB RAM, running Microsoft Windows 10 Core x64 Edition. This GPU took about 1 hour, 1 minute to complete the probable prime (PRP) test using GeneferOCL2. Tom Greer is a member of Antarctic Crunchers.

The prime was verified on 16 May 2022, 19:12:23 UTC by Albert Pastuszka (User B@P) of Poland using a GeForce GTX 750 in an AMD Athlon(tm) II X3 445 Processor with 6GB RAM, running Microsoft Windows 10 Professional x64 Edition. This computer took about 6 hours, 46 minutes to complete the probable prime (PRP) test using GeneferOCL2. Albert Pastuszka is a member of BOINC@Poland.

The PRP was confirmed prime by an AMD Ryzen 5 3600 6-Core Processor with 4GB RAM, running Linux Ubuntu. This computer took about 22 hours, 17 minutes to complete the primality test using LLR.

For more details, please see the official announcement.
7) Message boards : Problems and Help : High CPU usage for GPU apps (Message 155382)
Posted 144 days ago by ReggieProject donor
I've had similar problems in the past on Linux. This is the solution I used.
8) Message boards : News : Another 321 Mega Prime! (Message 155340)
Posted 146 days ago by ReggieProject donor
On 24 March 2022, 17:27:33 UTC, PrimeGrid’s 321 Prime Search found the Mega Prime:

3*2^18924988-1

The prime is 5,696,990 digits long and enters Chris Caldwell's “The Largest Known Primes Database” ranked 18th overall.

The discovery was made by Frank Matillek (boss) of Germany using an Intel CPU with 1GB RAM, running Ubuntu Linux. This computer took about 1 day, 1 hour, 39 minutes to complete the primality test using LLR2. Frank Matillek is a member of the SETI.Germany team.

For more details, please see the official announcement.
9) Message boards : News : 321 Mega Prime! (Message 155339)
Posted 146 days ago by ReggieProject donor
On 8 January 2022, 20:46:05 UTC, PrimeGrid’s 321 Prime Search found the Mega Prime:

3*2^18196595-1

The prime is 5,477,722 digits long and has entered Chris Caldwell's “The Largest Known Primes Database” ranked 20th overall.

The discovery was made by an anonymous user of Poland using an Intel(R) Core(TM) i9-9900K CPU @ 3.60GHz with 32GB RAM, running Microsoft Windows 10 Professional x64 edition. This computer took about 2 hours, 40 minutes to complete the primality test using LLR2.

For more details, please see the official announcement.
10) Message boards : Project Staging Area : PRPNet Credit may be Irregular Until Further Notice (Message 154822)
Posted 204 days ago by ReggieProject donor
I have seen it said that the ratio is 20:1

Yes, it's a bit buried in the forums, but that is the ratio.

No,

At https://www.primegrid.com/home.php, I have got 2,996,796 PSA credit, as available to the BOINC system.

At http://prpnet.primegrid.com:12006/user_stats.html, I have got 59,852,608 (59,696,348+156,260 separated)

That's 56,855,812 in credit still missing and unchanged for about two months. That's irregular reported and on topic, if any.

From that ratio, your credit is accurate. This is off topic - see the thread title - "PRPNet Credit may be Irregular Until Further Notice". I've been doing credit regularly for a while now, so I'm locking this thread. Make new threads in the future.


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