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Old 2012-09-14, 09:34   #21
Kosmaj
 
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Nov 2003

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Of course you can sieve Mersenne primes with srsieve but it will very unefficient, because srsieve is a general purpose sieving software not employing the fact that factors can be only of form 2*m*n+1 (of 2^n-1). So even PrimeForm which has this feature will be faster than srsieve. But Gimps has many more speed-ups, and can do P-1 test, ecm curves and so on. You can download Gimps and try sieving without joining the project.

Regarding 5*n^2-1, can you tell us which file have you tried to sieve, and what factors have you found? Those test files are not the latest version, but they are fairly new, from a sieving file released a few months ago.
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