It is of absolutely no use in reading in a list of factors. The factors of Mersenne numbers with prime exponents is disjoint: a prime dividing one Mp will not divide another Mq.
Reading in from disk takes time too,
It is better to loop over k for 2pk+1. For example M11 is (2*11+1)*(2*4*11+1)
Going up to "10 digits" is pathetic. The guys (an gals) here go up to over 24 digits routinely.
Last fiddled with by paulunderwood on 20201023 at 09:05
