When doing P-1 factoring the b1 is actually b1*M

suppose we test M=67 to b1=1000

It actually look for factor of the form (2*....*M*b1*M+1)

If it is (2*...*M+1) then the factor is found right away.

Would it become faster to do P-1 testing rather than trial at higher mersenne numbers?

ex. 79299959 has been P-1 tested to 8000000

so 2*...*79299959*8000000*79299959+1 76bits+

trial shows 79299959,72

or Have I got the whole thing wrong

ps I never do stage 2 as it messes stage 1 save files. I keep my files as it continues to higher level from where it leftoff.