A139480 a(n) = A000043(n) - 3.

0, 2, 4, 10, 14, 16, 28, 58, 86, 104, 124, 518, 604, 1276, 2200, 2278, 3214, 4250, 4420, 9686, 9938, 11210, 19934, 21698, 23206, 44494, 86240, 110500, 132046, 216088, 756836, 859430, 1257784, 1398266, 2976218, 3021374, 6972590, 13466914, 20996008, 24036580, 25964948

Offset

2,2

Comments

2^a(n)-1 is divisible by 3. For (2^a(n)-1)/3 see A124477.

For a(n)/2 see A139481.

Links

Amiram Eldar, Table of n, a(n) for n = 2..48

Mathematica

MersennePrimeExponent[Range[2, 48]] - 3 (* Amiram Eldar, Oct 17 2024 *)

Crossrefs

Cf. A000043, A000668, A124477, A139479, A139481.

Sequence in context: A057283 A308987 A107992 * A227388 A152749 A081115

Adjacent sequences: A139477 A139478 A139479 * A139481 A139482 A139483

Keyword

nonn

Author

Artur Jasinski, Apr 22 2008

Extensions

Definition corrected by Omar E. Pol, May 23 2008

Edited by N. J. A. Sloane, May 23 2008

a(40)-a(42) from Amiram Eldar, Oct 17 2024

Status

approved