

A050570


Numbers n such that 89*2^n1 is prime.


0



4, 8, 12, 24, 48, 52, 64, 84, 96, 1272, 2028, 3224, 4952, 6892, 7372, 16476, 56968, 68632, 185868, 208824, 369628
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OFFSET

1,1


LINKS

Table of n, a(n) for n=1..21.
Ray Ballinger and Wilfrid Keller, List of primes k.2^n + 1 for k < 300
Wilfrid Keller, List of primes k.2^n  1 for k < 300
Index entries for sequences of n such that k*2^n1 (or k*2^n+1) is prime
Kosmaj, Riesel list k<300.


PROG

(PARI) is(n)=ispseudoprime(89*2^n1) \\ Charles R Greathouse IV, Jun 13 2017


CROSSREFS

Sequence in context: A157416 A278602 A059992 * A233341 A102110 A055079
Adjacent sequences: A050567 A050568 A050569 * A050571 A050572 A050573


KEYWORD

hard,nonn,changed


AUTHOR

N. J. A. Sloane, Dec 29 1999


EXTENSIONS

More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 02 2008


STATUS

approved



