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Originally Posted by jocelynl
When doing P-1 factoring the b1 is actually b1*M
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What is your definition of M?
My understanding is that, in the Prime95 implementation of the P-1 algorithm, b1 is the upper limit on the prime factors of the "k" of potential factors 2kp+1 of 2
p-1 that are to be found by the P-1 method.
That is, stage 1 P-1 with b1 = 10000 performed on 2
p-1 will find any factor 2kp+1 of 2
p-1 in which the largest prime factor of k is less than (or equal to, if b1 were prime itself) 10000.