

A137652


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


2



1, 2, 3, 8, 21, 26, 31, 50, 55, 69, 392, 661, 12648
(list;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

1,2


COMMENTS

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


LINKS

Table of n, a(n) for n=1..13.


MATHEMATICA

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


PROG

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


CROSSREFS

Cf. A137653, A137654.
Sequence in context: A175490 A118854 A192151 * A185381 A251608 A288252
Adjacent sequences: A137649 A137650 A137651 * A137653 A137654 A137655


KEYWORD

nonn,more


AUTHOR

Zak Seidov, Feb 01 2008


EXTENSIONS

a(13) from Jinyuan Wang, Mar 05 2020


STATUS

approved



