mersenneforum.org New ECPP record (currently: 59,798 digits)
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2022-03-24, 07:15   #56
sweety439

"99(4^34019)99 palind"
Nov 2016
(P^81993)SZ base 36

368210 Posts

Quote:
 Originally Posted by paulunderwood R49081 also tops the top20 Unique primes: https://primes.utm.edu/top20/page.php?id=62 Thanks to Ray Chandler for pointing it out.
2^82589933-1 and (2^95369+1)/3 are also generalized unique primes (in base 2)

 2022-04-16, 22:33 #57 paulunderwood     Sep 2002 Database er0rr 24·281 Posts R49081's certificate has been independently verified by factorDB
 2022-05-08, 18:23 #58 ixfd64 Bemusing Prompter     "Danny" Dec 2002 California 5×499 Posts For those who don't follow the "And now for something completely different" forum, here's another new ECPP record as well as a new open source ECPP implementation that's faster than Primo: https://mersenneforum.org/showthread.php?t=27775 Last fiddled with by ixfd64 on 2022-05-08 at 18:24
 2022-09-09, 19:39 #59 paulunderwood     Sep 2002 Database er0rr 24·281 Posts Congrats to Andreas Enge for using his own ECPP software CM to prove tau 199^4518 at 57,125 digits In factorDB - http://factordb.com/index.php?id=1100000003886300622
 2022-12-13, 21:18 #60 frmky     Jul 2003 So Cal 1010001011002 Posts 125330^3+3^125330, at 59,798 digits, is prime.
2022-12-13, 21:31   #61
paulunderwood

Sep 2002
Database er0rr

449610 Posts

Quote:
 Originally Posted by frmky 125330^3+3^125330, at 59,798 digits, is prime.
Congrats!!!!!! https://primes.utm.edu/primes/page.php?id=134631

Pray tell what hardware you used and how long the proof took.

Last fiddled with by paulunderwood on 2022-12-13 at 21:36

2022-12-13, 23:45   #62
frmky

Jul 2003
So Cal

260410 Posts

Quote:
 Originally Posted by paulunderwood Congrats!!!!!! https://primes.utm.edu/primes/page.php?id=134631 Pray tell what hardware you used and how long the proof took.
It was completed with CM + GWNUM for the stage 1 primality step. Stage 1 was run on 6 nodes, each with two Xeon E5-2670 v2 10-core CPUs, totaling 120 cores, and took just over two months to complete. Stage 2 was less organized because some steps took longer than the 100 hour runtime limit imposed by the cluster queue. Thus it was inefficiently shuttled around to available machines as needed, and took about three calendar months to complete.

Last fiddled with by frmky on 2022-12-13 at 23:46

2022-12-14, 01:05   #63
chalsall
If I May

"Chris Halsall"
Sep 2002

5·7·317 Posts

Quote:
 Originally Posted by frmky Thus it was inefficiently shuttled around to available machines as needed, and took about three calendar months to complete.
Ummm... Wow... 8-)

2022-12-14, 03:32   #64
frmky

Jul 2003
So Cal

22·3·7·31 Posts

Quote:
 Originally Posted by chalsall Ummm... Wow... 8-)
Should I have said the methodology was adapted to optimize use of available resources?

 2022-12-14, 03:49 #65 Batalov     "Serge" Mar 2008 Phi(4,2^7658614+1)/2 1006110 Posts I can relate. I recently had a test where Stage 2 "test #0" was not finished when 90% of the other tests were already finished. If that process gets killed - you have to start from scratch because no data in the state file (.cert2) are written that are not in sequence from #0 to #tests. Maybe this can be refactored (thinking about it)? So if you had the same then you are stuck on redoing all the same things again and again until the resources are enough for compound Stage 2 test. I think even if suboptimal - the Primo strategy of writing finished .t#n files are written when the are finished. They do not have to be a "single flat file" database; they can be (fwiw) a flat fileset database
2022-12-14, 03:54   #66
paulunderwood

Sep 2002
Database er0rr

119016 Posts

Quote:
 Originally Posted by Batalov I recently had a test where Stage 2 "test #0" was not finished when 90% of the other tests were already finished. If that process gets killed - you have to start from scratch because no data in the state file (.cert2) are written that are not in sequence from #0 to #tests. Maybe this can be refactored (thinking about it)?
That would be a nice feature. Duplicated work is not welcomed. Maybe someone can tell the author.

Last fiddled with by paulunderwood on 2022-12-14 at 03:56

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