A174265 Odd Mersenne exponents.

3, 5, 7, 13, 17, 19, 31, 61, 89, 107, 127, 521, 607, 1279, 2203, 2281, 3217, 4253, 4423, 9689, 9941, 11213, 19937, 21701, 23209, 44497, 86243, 110503, 132049, 216091, 756839, 859433, 1257787, 1398269, 2976221, 3021377, 6972593, 13466917

Offset

1,1

Comments

Primes p such that exactly one of 2^p-1 and 2^p+1 is prime.

Links

Table of n, a(n) for n=1..38.

Formula

a(n)=A000043(n+1).

Crossrefs

Cf. A000043, A092506.

Sequence in context: A144296 A045399 A122834 * A346645 A107360 A058341

Adjacent sequences: A174262 A174263 A174264 * A174266 A174267 A174268

Keyword

nonn

Author

Juri-Stepan Gerasimov, Mar 14 2010

Extensions

Corrected by Charles R Greathouse IV, Mar 19 2010

Status

approved