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A171058 Numbers k such that 3^k + 3*k + 1 is prime. 4
0, 1, 3, 41, 45, 83, 95, 181, 193, 195, 311, 325, 901, 1825, 3649, 7709, 16335, 45547 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..18.

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).

Cf. A176805, A180269.

Sequence in context: A327356 A295612 A286661 * A105906 A157009 A100765

Adjacent sequences:  A171055 A171056 A171057 * A171059 A171060 A171061

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

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Last modified January 24 13:24 EST 2020. Contains 331193 sequences. (Running on oeis4.)