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From: mtf@ark.UUCP (Mark Scheffer)
Newsgroups: net.math
Subject: Re: Mersenne Primes (in general)
Message-ID: <558@ark.UUCP>
Date: Mon, 7-Oct-85 10:38:50 EDT
Article-I.D.: ark.558
Posted: Mon Oct  7 10:38:50 1985
Date-Received: Wed, 9-Oct-85 06:35:44 EDT
References: <359@faron.UUCP> <650@grkermi.UUCP> <582@linus.UUCP>
Reply-To: mtf@ark.UUCP (Mark Scheffer)
Distribution: net
Organization: VU Informatica, Amsterdam
Lines: 21

In article <582@linus.UUCP> bs@linus.UUCP (Robert D. Silverman) writes:
>> In article <359@faron.UUCP> bs@faron.UUCP (Robert D. Silverman) writes:
>> >The exponents for the thirty known Mersenne primes are:
>> >
>> >1,2,3,5,7,13,17,19,31,61,89,107,127,521,607,1279,2203,2281,3217,4253,9941,
>> >11213,19937,21701,23209,44497,86243,132049,216091
>> 
>> I count only 29.  Is one missing from the above list, or is 29 the correct
>> number?  Where is this list available?
>
>Sorry about that: 4423 was left out

1. I still count 29, 2^2 -1 = 1 is certainly not a prime, 1 is a unit.

2. There are 30 known Mersenne primes (85-10-07, 2:15 p.m): M9689 is also prime.

3. A list of Mersenne primes is available in almost every book on elementary
   number theory. 

			Mark Scheffer.  (mtf@ark.UUCP)
			{seismo|decvax|philabs}!mcvax!vu44!ark!mtf