A137652 Numbers k such that 12^k + 5 is prime.

1, 2, 3, 8, 21, 26, 31, 50, 55, 69, 392, 661, 12648, 31038

Offset: 1

Author

Zak Seidov, Feb 01 2008

Keywords

• nonn
• more

Comments

a(14) > 15000. - Jinyuan Wang, Mar 05 2020

Crossrefs

Cf. A137653, A137654.

Programs

Mathematica

Do[If[PrimeQ[(12^n+5)],Print[n]],{n,2000}]

PARI

is(n)=ispseudoprime(12^n+5) \\ Charles R Greathouse IV, Jun 06 2017

Extensions

a(13) from Jinyuan Wang, Mar 05 2020

a(14) from Michael S. Branicky, Jul 07 2024