mersenneforum.org need help with ecm lines
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 2007-11-16, 00:52 #1 jasong     "Jason Goatcher" Mar 2005 3·7·167 Posts need help with ecm lines I apologize for this easy question, but when I tried to search for the obvious 'ecm=' as a search term, both Mersenne Forum and Google choked on the '=' even though it was typed as Code: "ecm=" Could someone give me a linkie, please? Edit: For version 24.14 Edit 2: It has to do with numbers b^n-1, with b an odd prime and n a prime. The Odd Perfect Number search is what I'm crunching for. If it helps you help me, than the specific numbers at the moment are 2801^79-1 and 2801^83-1. Last fiddled with by jasong on 2007-11-16 at 01:08
2007-11-16, 02:13   #2
jasong

"Jason Goatcher"
Mar 2005

3·7·167 Posts

I found the following in the mprime readme.txt file. What are the 'not used anymore' options?
Quote:
 ECM=751,3000000,0,100,0,0,0,0 The first value is the exponent. The second value is bound #1. The third value is bound #2 - leave it as zero. The fourth value is the number of curves to test. The fifth value is no longer used. The sixth value is the specific curve to test - it is only used in debugging. The seventh value is 0 for 2^N-1 factoring, 1 for 2^N+1 factoring. The eighth value is no longer used.

 2007-11-16, 03:18 #3 jasong     "Jason Goatcher" Mar 2005 1101101100112 Posts Found the answer: ECM2=k,b,n,c,B1,B2,curves_to_do[,specific_sigma,B2_start]
 2007-11-16, 07:32 #4 Prime95 P90 years forever!     Aug 2002 Yeehaw, FL 816810 Posts For b != 2, GMP-ECM may be faster.

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