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A137652
Numbers k such that 12^k + 5 is prime.
2
1, 2, 3, 8, 21, 26, 31, 50, 55, 69, 392, 661, 12648, 31038
OFFSET
1,2
COMMENTS
a(14) > 15000. - Jinyuan Wang, Mar 05 2020
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
Sequence in context: A175490 A118854 A192151 * A185381 A251608 A288252
KEYWORD
nonn,more
AUTHOR
Zak Seidov, Feb 01 2008
EXTENSIONS
a(13) from Jinyuan Wang, Mar 05 2020
a(14) from Michael S. Branicky, Jul 07 2024
STATUS
approved