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 2017-03-06, 09:35 #1 ET_ Banned     "Luigi" Aug 2002 Team Italia 10010100111102 Posts What is the next B1? I am focusing on ECM on Fermat numbers with mprime. My question is: what is the next B1 range for F12, after 800,000,000? I have heard people doing B1 = 2,900,000,000, is it correct?
2017-03-06, 12:33   #2
swellman

Jun 2012

2·1,429 Posts

Quote:
 Originally Posted by ET_ I am focusing on ECM on Fermat numbers with mprime. My question is: what is the next B1 range for F12, after 800,000,000? I have heard people doing B1 = 2,900,000,000, is it correct?
https://members.loria.fr/PZimmermann...cm/params.html

2017-03-06, 14:42   #3
ET_
Banned

"Luigi"
Aug 2002
Team Italia

2·2,383 Posts

Quote:
 Originally Posted by swellman https://members.loria.fr/PZimmermann...cm/params.html
Thank you swellman. I was asking basicly for 2 reasons:

1 - I am using mprime, not GMP-ECM: mprime has different B2 parametrization.
2 - The page at https://www.mersenne.org/report_ecm/ based on mprime work over Fermat ecm shows B1 = 800,000,000 instead of 850,000,000.

Luigi

 2017-03-06, 15:56 #4 swellman     Jun 2012 2×1,429 Posts Sorry I missed the fact you're using mprime. Don't have optimal parameters for it, though I suspect they are close to gmp-ecm in magnitude. Good luck!
 2017-03-06, 16:21 #5 henryzz Just call me Henry     "David" Sep 2007 Cambridge (GMT/BST) 10110010110102 Posts If you are talking about optimal you would change the bounds after every curve. Here is some reading http://www.mersenneforum.org/showthread.php?t=21420

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