

A059091


Numbers k such that 3*7^k  2 is prime.


1



1, 11, 168, 185, 467, 767, 1400, 1428, 1736, 2516, 3275, 3540
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OFFSET

1,2


COMMENTS

a(13) > 37584.  Jinyuan Wang, Jan 21 2020


LINKS

Table of n, a(n) for n=1..12.


MATHEMATICA

Do[ If[ PrimeQ[ 3*7^n  2 ], Print[n] ], {n, 1, 5000} ]


PROG

(PARI) is(n)=ispseudoprime(3*7^n2) \\ Charles R Greathouse IV, Jun 13 2017
(Magma) [k: k in [0..1000]  IsPrime(3*7^k2)]; // Jinyuan Wang, Jan 21 2020


CROSSREFS

Cf. A059041 (3*7^k+2 is prime).
Sequence in context: A088293 A145559 A159968 * A255971 A157944 A233290
Adjacent sequences: A059088 A059089 A059090 * A059092 A059093 A059094


KEYWORD

nonn,more


AUTHOR

Robert G. Wilson v, Feb 12 2001


STATUS

approved



