**Mersenne exponents: primes p such that 2^p - 1 is prime. Then 2^p - 1 is called a Mersenne prime.**

*2, 3, 5, 7, 13, 17, 19, 31, 61, 89, 107, 127, 521, 607, 1279, 2203, 2281, 3217, 4253*

Index of A-numbers in seqfan: by ascending order
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*11 seqfan posts*

*Tue Dec 6 04:12:00 CET 2011* [seqfan] Re: Use of Easy keyword

*Tue Dec 6 04:03:29 CET 2011* [seqfan] Re: Use of Easy keyword

*Fri Sep 30 19:36:48 CEST 2011* [seqfan] Re: easy and bref

*Fri Sep 30 19:22:15 CEST 2011* [seqfan] Re: easy and bref

*Fri Sep 30 19:07:25 CEST 2011* [seqfan] Re: easy and bref

*Fri Oct 29 05:35:16 CEST 2010* [seqfan] Implementing first 500 sequences in Java

*Thu Jul 15 05:43:53 CEST 2010* [seqfan] Re: Interest Poll: BOINC project for "hard" sequences

*Sat Mar 6 10:34:06 CET 2010* [seqfan] Re: Sums of a Mersenne prime and a Fermat prime; Means of a Mersenne prime and a Fermat prime; prime means of a Mersenne prime and a Fermat prime

*Mon Mar 1 21:04:43 CET 2010* [seqfan] Re: Decimal expansion of sum of the reciprocals of the Mersenne primes

*Sat Jan 16 04:25:29 CET 2010* [seqfan] What is the next prime p after 2 such that concatenating p values of A00043 is a prime, and p is itself in A000043?

*Tue Apr 21 23:36:56 CEST 2009* [seqfan] comments about perfect numbers

Index of A-numbers in seqfan: by ascending order
by month
by frequency
by keyword

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