View Single Post
Old 2019-06-27, 04:13   #22
Dylan14's Avatar
Mar 2017

24×37 Posts

Originally Posted by rogue View Post
mmff is far faster than dmdsieve for smaller exponents. I don't know if it has a limit for larger exponents. If it does, then it probably wouldn't be difficult to create a "dwdsieve".
Looking at the source code for mmff, it appears the limits are
Exponents 31, 61, 89, 107, 127 for double Mersennes and
Exponents <= 223 for Fermat numbers.
Largest bit level it can test depends on the exponent (see lines 356-455 of mfaktc.c in the source of mmff).
Dylan14 is offline   Reply With Quote