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1) Message boards : Aggie The Pew message board (Message 139059)
Posted 8 days ago by Scott BrownProject donor
Got possible severe weather headed our way. Springtime


Same here for tonight...at least the temps here are pleasant.

2) Message boards : Aggie The Pew message board (Message 138982)
Posted 12 days ago by Scott BrownProject donor

Sorry guys...the big IF didn't happen as things at the university are in a mad scramble now. Likely looking at all buildings here being locked down to card access only sometime later today to stop any students and visitors from entering.

Wish I could have added a bit more push, but I am maxed out now for the rest of the challenge.

3) Message boards : Number crunching : So Long, and Thanks for All the Fish (Message 138892)
Posted 15 days ago by Scott BrownProject donor
I hope I haven't waited too long to post here as I wanted to say these things while both Mike and Jim are still lurking behind the scenes.

I cannot express in words how grateful I am to both Mike and Jim for their work and dedication to PrimeGrid. It has been my distinct pleasure to serve with them on the administration team at PG for a number of years. They have been the heart and soul of this project during that time (no offense to Rytis or other admins who have served over this period), and I cannot imagine what PG would have been like without their guidance and hard work.

Jim has been an especially behind the scenes admin. He has been more active on the forum and in our Discord chat over the last couple of years, but most of you are truly unaware of the things he has done that you never noticed. It has been very common for Jim to run the verification DC work on large primes on his own machines. He frequently has "sped up" the completion of challenges by doing the same with work that was struggling to complete in a timely fashion. And I know the new administration team is profoundly appreciative of the automated programming elements that he has added to the PG servers, even over the last couple of weeks.

Mike, of course, has been a very public face of PG as an admin. There is no one who has done more to help new users, novice prime hunters, and more skilled crunchers with their problems over the years. He has the rather ironic "Shut-UP!" badge for his record numbers of forum posts--the irony of course being that almost no one would really wish him to do so. He also has done a great deal to enhance the user experience when crunching at PG, the latest large example being those lovely "first" rates on each user's account page.

I must also admit to being baffled by the waking hours kept by both Jim and Mike. I might be up at 5am to get my kids going for the morning school bus or up late at midnight or 1am grading my university students' papers...Jim and Mike always seemed to be online! I don't know how they have done it, although my theory is that Jim is actually at least part machine and Mike has that bird that must keep him up...or wait, I think it is a parrot, so it can speak...and maybe type...hmm? :)

For my own part, I can truly say that I have only rarely had the opportunity to work with individuals as skilled, polite, and respectful as either Mike or Jim. And that is especially impressive given that all of our interactions have been online in the forum, private message, or chat room. I regret that we have never had the opportunity to meet in person. You have both been wonderful colleagues here, and for me at least, I consider you both in some way to be friends. You will quite obviously be missed by all who crunch here at PG. And I will miss our conversations...

Best of luck to you both on your next adventure (I somehow find it difficult to believe that either of you will ever be idling your time away)!
4) Message boards : Aggie The Pew message board (Message 138891)
Posted 15 days ago by Scott BrownProject donor

If things go well (and that is a BIG IF), I may be able to add some machines later today or this evening. If so, we might be able to give Pavel a run for his money. ;)

5) Message boards : Aggie The Pew message board (Message 138808)
Posted 17 days ago by Scott BrownProject donor
Looking at a few of the completed tasks, the credit is lower than I remembered or I just forgot (most likely this is the case) but the amounts do jump all over the place.

Here is my sample of 159 units: https://www.primegrid.com/results.php?userid=386066&offset=0&show_names=0&state=4&appid=19 ... roughly between 2275 and 2435 credits per unit with the odd exception here and there..

I've forgotten but is credit also related to the speed of the performance?


No, it is FFT sizes which can vary modestly on SR5.

6) Message boards : General discussion : confirmed or not? (Message 138807)
Posted 17 days ago by Scott BrownProject donor

GFN finds are PRP when reported by your client. Either the server (or on some larger GFN, one of the admin's machines) verifies the prime with LLR, which is a definitive test. When you see it show up in your account, that process has been completed.

7) Message boards : News : SR5 Mega Prime! (Message 138789)
Posted 17 days ago by Scott BrownProject donor
On 5 March 2020, 14:40:22 UTC, PrimeGrid’s Sierpinski/Riesel Base 5 Problem project eliminated k=35816 by finding the mega prime:

35816*5^2945294-1

The prime is 2,058,677 digits long and enters Chris Caldwell's “The Largest Known Primes Database” ranked 73rd overall and is the largest known base 5 prime. 66 k’s now remain in the Riesel Base 5 problem.

The discovery was made by Pavel Atnashev (Pavel Atnashev) of Russia using an Intel(R) Xeon(R) E5-2660 v2 CPU @ 2.20GHz with 8GB RAM running Linux. This computer took about 3 hours 56 minutes to complete the primality test using LLR. Pavel Atnashev is a member of the Ural Federal University team.

The prime was verified on 6 March 2020, 21:41:36 UTC by John Hall (JH30895) of the United States using an Intel(R) Xeon(R) W-3245 CPU @ 3.20GHz with 385GB RAM, running Darwin 19.3.0. This computer took about 1 day, 7 hours 33 minutes to complete the primality test using LLR. John Hall is a member of the Antarctic Crunchers team.

For more details, please see the official announcement.

8) Message boards : Aggie The Pew message board (Message 138755)
Posted 19 days ago by Scott BrownProject donor

No, you got it right. 2:00am start for me means a rolling start for sure. Your on central time, right Rick? so 1:00am is correct.

9) Message boards : News : Another GFN-262144 Find!! (Message 138373)
Posted 30 days ago by Scott BrownProject donor
On 16 February 2020, 01:13:42 UTC, PrimeGrid's Generalized Fermat Prime Search found the Mega Prime:

9812766^262144+1

The prime is 1,832,857 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 15th for Generalized Fermat primes and 87th overall.

The discovery was made by Tom Greer (tng*) of the United States using an NVidia GeForce RTX 2070 in an Intel(R) Core(TM) i7-7700K CPU @ 4.20GHz with 16GB RAM, running Microsoft Windows 10 Core x64 Edition. This GPU took about 17 minutes to complete the probable prime (PRP) test using GeneferOCL2. Tom Greer is a member of the Sicituradastra. team.

The prime was verified on 16 February 2020, 01:39:49 UTC by Viktor Svantner (Viktor Svantner) of the Czech Republic using a GeForce GTX 1080 Ti in an AMD Ryzen Threadripper 2990WX 32-Core Processor with 128GB RAM, running Microsoft Windows 10 Professional x64 Edition. This computer took about 22 minutes to complete the probable prime (PRP) test using GeneferOCL2. Viktor Svantner is a member of the Czech National Team team.

The PRP was confirmed prime by an Intel(R) Xeon(R) CPU E3-1240 v6 @ 3.70GHz with 4GB RAM, running Linux Debian. This computer took about 6 hours, 6 minutes to complete the primality test using LLR.

For more details, please see the official announcement.

10) Message boards : News : GFN-262144 Find! (Message 138372)
Posted 30 days ago by Scott BrownProject donor
On 12 February 2020, 14:26:58 UTC, PrimeGrid's Generalized Fermat Prime Search found the Mega Prime:

9750938^262144+1

The prime is 1,832,137 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 15th for Generalized Fermat primes and 86th overall.

The discovery was made by Alen Kecic (Freezing) of Germany using an NVidia GeForce GTX 1660 Ti in an Intel(R) Core(TM) i7-7820X CPU @ 3.60GHz with 32GB RAM, running Microsoft Windows 10 Professional x64 Edition. This GPU took about 22 minutes to complete the probable prime (PRP) test using GeneferOCL2. Alen Kecic is a member of the SETI.Germany team.

The prime was verified on 12 February 2020, 14:32:50 UTC by Tom Greer (tng*) of the United States using an NVidia GeForce RTX 2080 in an Intel(R) Core(TM) i9-9900K CPU @ 3.60GHz with 16GB RAM, running Microsoft Windows 10 Professional x64 Edition. This computer took about 13 minutes to complete the probable prime (PRP) test using GeneferOCL2. Tom Greer is a member of the Sicituradastra. team.

The PRP was confirmed prime by an Intel(R) Xeon(R) CPU E3-1240 v6 @ 3.70GHz with 4GB RAM, running Linux Debian. This computer took about 13 hours, 22 minutes to complete the primality test using LLR.

For more details, please see the official announcement.



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