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Old 2017-03-06, 09:35   #1
ET_
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"Luigi"
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Default 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?
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Old 2017-03-06, 12:33   #2
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Quote:
Originally Posted by ET_ View Post
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
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Old 2017-03-06, 14:42   #3
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Quote:
Originally Posted by swellman View Post
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
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Old 2017-03-06, 15:56   #4
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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!
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Old 2017-03-06, 16:21   #5
henryzz
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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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