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A174265
Odd Mersenne exponents.
3
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
FORMULA
a(n) = A000043(n+1).
MATHEMATICA
MersennePrimeExponent[Range[2, 48]] (* Amiram Eldar, Oct 21 2024 *)
CROSSREFS
Sequence in context: A144296 A045399 A122834 * A346645 A107360 A058341
KEYWORD
nonn,changed
AUTHOR
EXTENSIONS
Corrected by Charles R Greathouse IV, Mar 19 2010
STATUS
approved