cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A112649 Numbers k such that the k-th Mersenne prime exponent is not a Gaussian prime (not 3 mod 4).

Original entry on oeis.org

1, 3, 5, 6, 9, 10, 13, 17, 18, 19, 21, 22, 23, 24, 25, 26, 27, 30, 33, 35, 36, 37, 38, 39, 43, 44, 46, 47, 48
Offset: 1

Views

Author

Jorge Coveiro, Dec 27 2005

Keywords

Crossrefs

Cf. A000043, A112648 (complement).

Programs

  • Mathematica
    Select[Range[48], Mod[MersennePrimeExponent[#], 4] != 3 &] (* Amiram Eldar, Oct 18 2024 *)

Formula

{k: A000043(k) <> 3 (mod 4)}.

Extensions

Edited by Don Reble, Jan 25 2006
a(25)-a(29) from Amiram Eldar, Oct 18 2024