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

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

1,2

Links

Table of n, a(n) for n=1..29.

Formula

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

Mathematica

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

Crossrefs

Cf. A000043, A112648 (complement).

Sequence in context: A187417 A072716 A167384 * A050083 A081175 A269110

Adjacent sequences: A112646 A112647 A112648 * A112650 A112651 A112652

Keyword

nonn

Author

Jorge Coveiro, Dec 27 2005

Extensions

Edited by Don Reble, Jan 25 2006

a(25)-a(29) from Amiram Eldar, Oct 18 2024

Status

approved