A174153 Numbers k such that 2*13^k - 1 is prime.

2, 8, 10, 64, 76, 118, 120, 258, 303, 332, 364, 528, 811, 1270, 1362, 1607, 2091, 2572, 3596, 8190

Offset

1,1

Comments

a(21) > 14400. - Jinyuan Wang, Feb 26 2020

Links

Table of n, a(n) for n=1..20.

Mathematica

Select[Range[5000], PrimeQ[(2 13^# - 1)] &] (* Vincenzo Librandi, Oct 05 2012 *)

Prog

(Magma) /* The code gives only the terms up to 1607: */ [n: n in [0..1700] | IsPrime(2*13^n-1)];
(PARI) is(n)=ispseudoprime(2*13^n-1) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

Sequence in context: A188539 A230826 A071184 * A171976 A362278 A081231

Adjacent sequences: A174150 A174151 A174152 * A174154 A174155 A174156

Keyword

nonn,more

Author

Vincenzo Librandi, Mar 10 2010

Extensions

a(14)-a(19) from Vincenzo Librandi, Oct 05 2012

a(20) from Jinyuan Wang, Feb 26 2020

Status

approved