

A059747


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


0



2, 3, 4, 5, 8, 12, 15, 17, 20, 21, 45, 48, 87, 97, 113, 120, 172, 217, 228, 276, 312, 580, 692, 1132, 1588, 1668, 2576, 2591, 3780, 4311, 4412, 6205, 11952
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OFFSET

1,1


COMMENTS

Next term > 12000. Vincenzo Librandi, Sep 29 2012


LINKS

Table of n, a(n) for n=1..33.


MATHEMATICA

Do[ If[ PrimeQ[ 3*2^n  7 ], Print[n] ], {n, 3000} ]
Select[Range[6500], PrimeQ[(3*2^#  7)] &] (* Vincenzo Librandi, Sep 29 2012 *)


PROG

(PARI) is(n)=ispseudoprime(3*2^n7) \\ Charles R Greathouse IV, Jun 13 2017


CROSSREFS

Sequence in context: A048486 A179402 A065428 * A254328 A094087 A225132
Adjacent sequences: A059744 A059745 A059746 * A059748 A059749 A059750


KEYWORD

nonn,more


AUTHOR

Robert G. Wilson v, Feb 10 2001


EXTENSIONS

a(29)a(32) from Vincenzo Librandi, Sep 29 2012
a(33) from Bruno Berselli, Sep 30 2012


STATUS

approved



