A309854 Numbers k such that 2*k^5 - 1 is prime.

6, 7, 10, 12, 15, 22, 34, 46, 57, 60, 64, 75, 81, 82, 84, 94, 112, 117, 129, 132, 151, 160, 169, 171, 175, 186, 196, 210, 214, 222, 225, 255, 264, 292, 301, 309, 315, 330, 357, 364, 369, 370, 379, 381, 384, 400, 412, 417, 426, 430, 454, 474, 516, 547, 549, 582, 610, 631, 636, 655

Offset: 1

Author

R. J. Mathar, Aug 20 2019

Keywords

• nonn

Links

• Robert Israel, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A214289 (2*k^3 - 1 prime), A182783 (2*k^4 - 1 prime), A309855 (subset of primes).

Programs

Maple

filter:= k -> isprime(2*k^5-1):
select(filter, [$1..1000]); # Robert Israel, Oct 29 2023

PARI

isok(k) = isprime(2*k^5 - 1); \\ Michel Marcus, Jul 22 2021