The following was posted on sci.math recently (not by me, unfortunately):
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Subject: Mersenne Prime
From: <[EMAIL PROTECTED]>
Newsgroups: sci.math
Date: Thu, 25 Mar 1999 18:10:30 +0800
Message-ID: <7dd21c$[EMAIL PROTECTED]>
Mp is a Mersenne Prime with odd prime p "iff"
3^((Mp-1)/2)=-1 (mod Mp) .
Please mail to : [EMAIL PROTECTED]
(before 3/30)
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At first sight, I thought "that's not right", but a few minutes of testing a
few Mersenne primes and non-prime Mersenne numbers on my TI-92+ has upheld the
"iff". Can anyone find a counterexample? This is bugging me. Augh!
S.T.L.
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