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A050617
Numbers n such that 151*2^n-1 is prime.
0
5, 221, 641, 2783, 6423, 9053, 23271, 29159, 88409, 113655, 241271, 263895
OFFSET
1,1
PROG
(PARI) is(n)=ispseudoprime(151*2^n-1) \\ Charles R Greathouse IV, Jun 13 2017
CROSSREFS
Sequence in context: A261945 A024070 A290179 * A066462 A046193 A195633
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