On Fri, 26 Mar 1999, Henrik Olsen wrote:
> On Thu, 25 Mar 1999 [EMAIL PROTECTED] wrote:
> > 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)
> > **********
> > 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.
>
> For a counter example, try M(3)=2^3-1=7, a mersenne prime though
> 3^((7-1)/2)=27=6 mod 7
Paint me embarrased:) 6=-1 mod 7, Parkinson time I guess, and me only 33
years old :)
There are actually no counterexample for p<1500, I've checked them all.
--
Henrik Olsen, Dawn Solutions I/S
URL=http://www.iaeste.dk/~henrik/
Get the rest there.
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