A171058 - OEIS

A171058

Numbers k such that 3^k + 3*k + 1 is prime.

0, 1, 3, 41, 45, 83, 95, 181, 193, 195, 311, 325, 901, 1825, 3649, 7709, 16335, 45547

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OFFSET

1,3

COMMENTS

a(19) > 10^5. - Michael S. Branicky, Jul 25 2024

LINKS

PROG

(PARI) is(n)=ispseudoprime(3^n+3*n+1) \\ Charles R Greathouse IV, Jun 13 2017

CROSSREFS

Numbers k such that b^k + b*k + 1 is prime: A301634 (b=2), this sequence (b=3), A301635 (b=5).

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, Sep 04 2010, based on a posting to the Sequence Fans Mailing List by Charles R Greathouse IV, Aug 23 2010

EXTENSIONS

More terms from Charles R Greathouse IV, Sep 07 2010

STATUS

approved