Andy Messier wrote:
> 
> I can answer question 2.  Given the probability of finding a factor using
> P-1 and the times required to factor vs. primality testing, Prime95 will
> only P-1 factor to the extent that it minimizes the total CPU time required
> to test primality.

This is sensible and explains what "optimal" means.
However I have looked at the file "how much P-1 factoring" and there was no
consistency in the values of the two bounds as far as I could discern.

David

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