A088554 Primes of the form (5^k-1)/4 or (5^k+3)/4.

2, 7, 31, 157, 3907, 19531, 2441407, 12207031, 61035157, 305175781, 9313225746154785157, 177635683940025046467781066894531

Offset

1,1

Links

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

Mathematica

With[{kmax = 100}, Select[Flatten[Table[(5^k + {-1, 3})/4, {k, 0, kmax}]], PrimeQ]] (* Amiram Eldar, Jul 05 2024 *)

Crossrefs

Cf. A004061.

Sequence in context: A181066 A325452 A030945 * A107595 A193320 A030882

Adjacent sequences: A088551 A088552 A088553 * A088555 A088556 A088557

Keyword

nonn

Author

Cino Hilliard, Nov 17 2003

Extensions

Edited by Don Reble, May 03 2006

Status

approved