User TJAOI has done TF for all exponents in GIMPS range (<1G) up to 2^67
Mersenne numbers trial factoring (TF) effort gaps (missed bit levels):
0 exponents like this known
Exponent range: M to M
TF range: to
GHz-days effort: to Show TF assignments starting from 1 if B1 <=
(only for exponent >1M)

No matches in selected range