

A057915


Numbers k such that 2*5^k  3 is prime.


0



1, 2, 5, 6, 8, 9, 17, 76, 154, 188, 329, 497, 609, 1401, 2320, 3250, 3281, 5489, 6868, 7602
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OFFSET

1,2


COMMENTS

a(21) > 22802.  Jinyuan Wang, Dec 14 2019


LINKS

Table of n, a(n) for n=1..20.


MATHEMATICA

Do[ If[ PrimeQ[ 2*5^n  3 ], Print[ n ] ], {n, 1, 2000} ]


PROG

(PARI) is(n)=ispseudoprime(2*5^n3) \\ Charles R Greathouse IV, Jun 13 2017


CROSSREFS

Cf. A057914 (2*5^k + 3 is prime).
Sequence in context: A102611 A323112 A176114 * A154329 A176590 A253061
Adjacent sequences: A057912 A057913 A057914 * A057916 A057917 A057918


KEYWORD

nonn,more


AUTHOR

Robert G. Wilson v, Nov 16 2000


EXTENSIONS

a(18)a(20) from Jinyuan Wang, Dec 14 2019


STATUS

approved



