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Old 2007-11-16, 00:52   #1
jasong
 
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"Jason Goatcher"
Mar 2005

3×7×167 Posts
Default 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
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Old 2007-11-16, 02:13   #2
jasong
 
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"Jason Goatcher"
Mar 2005

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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.
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Old 2007-11-16, 03:18   #3
jasong
 
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"Jason Goatcher"
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Found the answer:

ECM2=k,b,n,c,B1,B2,curves_to_do[,specific_sigma,B2_start]
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Old 2007-11-16, 07:32   #4
Prime95
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For b != 2, GMP-ECM may be faster.
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