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Old 2006-01-18, 03:51   #1
jocelynl
 
Sep 2002

2·131 Posts
Default another p-1 question

P-1 usually finds smooth factor with gcd of 3^n! and 2^P-1

ex: p=67 N=2^p-1
a factor of N is 193707721 which 2*2*2*3*3*3*5*67*2677+1
So the gcd of 3^(2*2*2*3*3*3*5*67*2677) and N is 193707721

but there is also 3^(2*2*17*17*41*61*67+(4*67))

Has any work been do to find an algorythm like P-1 capable of finding smoother factors?


Joss
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