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A174265 Odd Mersenne exponents. 1
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 (list; graph; refs; listen; history; text; internal format)
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 * A107360 A058341 A116036

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

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Last modified June 4 11:09 EDT 2020. Contains 334825 sequences. (Running on oeis4.)