

A112648


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


1



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



