A112648 Integers k for which the k-th Mersenne prime exponent is a Gaussian prime (3 mod 4).

2, 4, 7, 8, 11, 12, 14, 15, 16, 20, 28, 29, 31, 32, 34, 40, 41, 42, 45

Offset

1,1

Links

Table of n, a(n) for n=1..19.

Example

A000043(45) = 37156667 is congruent to 3 mod 4, so 45 is in this sequence.
A000043(46) = 42643801 is congruent to 1 mod 4, so 46 is not in this sequence.

Mathematica

Select[Range@ 45, Mod[MersennePrimeExponent@ #, 4] == 3 &] (* Michael De Vlieger, Jul 22 2018 *)

Crossrefs

Cf. A000043, A112633, A112634, A112649.

Sequence in context: A050082 A209864 A182654 * A307284 A323108 A187418

Adjacent sequences: A112645 A112646 A112647 * A112649 A112650 A112651

Keyword

nonn

Author

Jorge Coveiro, Dec 27 2005

Extensions

Edited by Don Reble, Jan 25 2006

More terms from Gord Palameta, Jul 21 2018

Status

approved