Quote:
Originally Posted by jocelynl
When doing P1 factoring the b1 is actually b1*M

What is your definition of M?
My understanding is that, in the Prime95 implementation of the P1 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 P1 method.
That is, stage 1 P1 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.