

A094963


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


1



5, 7, 19, 23, 87, 107, 255, 1539, 2387, 4457, 5623, 15761, 22735, 27241
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OFFSET

1,1


COMMENTS

a(15) > 28500.  Jinyuan Wang, Feb 03 2020


LINKS

Table of n, a(n) for n=1..14.


MATHEMATICA

Do[ If[ PrimeQ[2^n  3n], Print[n]], {n, 1, 15000, 2}]


PROG

(PARI) is(k) = ispseudoprime(2^k3*k); \\ Jinyuan Wang, Feb 03 2020


CROSSREFS

Cf. A093988 (2^k + 3*k is prime).
Sequence in context: A058079 A076787 A332763 * A255490 A045446 A106074
Adjacent sequences: A094960 A094961 A094962 * A094964 A094965 A094966


KEYWORD

nonn,more


AUTHOR

Robert G. Wilson v, May 26 2004


EXTENSIONS

a(12)a(14) from Jinyuan Wang, Feb 03 2020


STATUS

approved



