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A050899
Numbers n such that 281*2^n-1 is prime.
0
2, 38, 62, 82, 598, 890, 1810, 2242, 2450, 17786, 51470, 65558, 91870, 93850
OFFSET
1,1
PROG
(PARI) is(n)=ispseudoprime(281*2^n-1) \\ Charles R Greathouse IV, Jun 13 2017
CROSSREFS
Sequence in context: A227468 A049487 A163792 * A068401 A173026 A294396
KEYWORD
hard,nonn
AUTHOR
N. J. A. Sloane, Dec 29 1999
EXTENSIONS
More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 02 2008
STATUS
approved