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Old 2011-03-04, 18:26   #15
R.D. Silverman
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"Bob Silverman"
Nov 2003
North of Boston

1D4816 Posts

Originally Posted by sascha77 View Post
OK. my fault. I forgotten to mention that mersenne Numbers are Numbers of the Form n = 2^{p}-1 with:
The variable p is prime !!!!!
That is one definition. You will also find the definition
spread throughout the literature that a Mersenne Number is of the
form 2^n-1 for any n .

Your example with mod 511 ->  511 -> 2^{9}-1
It is likely that I can find other counter-examples for the case n = prime
if I look hard enough.

It isn't worth my time.
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