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Old 2020-09-13, 06:12   #7
CRGreathouse's Avatar
Aug 2006

22×33×5×11 Posts

Originally Posted by bhelmes View Post
f should be a proper divisor from the non prime Mp,
where Mp is a Mersenne number with prime p.
In that case, I don't find any examples below the unfactored composite Mp = 2^1213 - 1.
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