A100914 Numbers k such that (273*2^k+1)^2-2 is prime.

6, 8, 15, 19, 30, 33, 50, 54, 61, 85, 190, 225, 270, 295, 323, 456, 616, 778, 1523, 2921, 3264, 6780, 8463, 10915, 11390, 13304, 13860, 16625, 17851, 21816, 33205, 35170, 35673

Offset

1,1

Comments

a(31) > 29391. - J.W.L. (Jan) Eerland, Dec 20 2021

Links

Table of n, a(n) for n=1..33.

S. Harvey, Carol and Kynea Primes.

Mathematica

DeleteCases[ParallelTable[If[PrimeQ[(273*2^n+1)^2-2], n, a], {n, 0, 21816}], a] (* J.W.L. (Jan) Eerland, Dec 20 2021 *)

Prog

(PARI) is(n)=ispseudoprime((273*2^n+1)^2-2) \\ Charles R Greathouse IV, Feb 19 2016

Crossrefs

Sequence in context: A315921 A315922 A315923 * A076672 A315924 A357358

Adjacent sequences: A100911 A100912 A100913 * A100915 A100916 A100917

Keyword

nonn,more

Author

Ray Chandler, Nov 21 2004

Extensions

a(24)-a(30) from J.W.L. (Jan) Eerland, Dec 20 2021

a(31)-a(33) from Michael S. Branicky, Mar 21 2024

Status

approved