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Old 2016-08-18, 03:43   #2
Romulan Interpreter
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Jun 2011

3·5·683 Posts

If you think about taking stage 1 file saved by P-1 and use it for stage 2 of ECM, the answer is "no".
Anyhow, you can do P-1 with a GPU, much faster, for both stage 1 and 2, and it is not limited to ~1200 bits like the gpu-ECM is.
That because P-1 for mersenne numbers is very efficient, moving the problem from "q-1 is smooth", to "k is smooth", where q=2kp+1 is the factor you are looking for, which means about "2p times" faster than ecm (well, that is a coarse approximation, and not exactly correct).

Last fiddled with by LaurV on 2016-08-18 at 03:47
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