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From: andrew@grkermi.UUCP (Andrew W. Rogers)
Newsgroups: net.math
Subject: Re: Mersenne Primes (in general)
Message-ID: <655@grkermi.UUCP>
Date: Sat, 5-Oct-85 20:10:59 EDT
Article-I.D.: grkermi.655
Posted: Sat Oct  5 20:10:59 1985
Date-Received: Mon, 7-Oct-85 06:15:49 EDT
References: <359@faron.UUCP> <650@grkermi.UUCP> <582@linus.UUCP>
Reply-To: andrew@grkermi.UUCP (Andrew W. Rogers)
Distribution: net
Organization: GenRad, Inc., Concord, Mass.
Lines: 16

In article <582@linus.UUCP> bs@linus.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...?
>
>Sorry about that: 4423 was left out

Knuth's _Seminumerical Algorithms_ lists 

	  9689
	2      - 1

as a Mersenne prime, too.