A133398 Numbers that are not Mersenne primes.

1, 2, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64

Offset: 1

Author

Omar E. Pol, Nov 22 2007, Apr 05 2008

Keywords

• easy
• nonn

Comments

Numbers that are not in A000668.

Terms a(1) to a(2042) coincide with those of A138836, but then a(2043)=2047 <> A138836(2043)=2048.

Crossrefs

Cf. A000037, A014092. Mersenne primes: A000668.

Cf. A138836.