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Old 2017-11-22, 16:44   #5
alpertron
 
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Aug 2002
Buenos Aires, Argentina

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For Mersenne numbers with small known factors in the range about 4.2M, there is no previous P-1 done, no ECM done and they were factored up to 64 bits. That means that I would find a factor in about 21 attempts.

At this moment I am running P-1 starting from 4.2M up.

Last fiddled with by alpertron on 2017-11-22 at 17:02
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