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A050580
Numbers n such that 109*2^n-1 is prime.
0
9, 149, 177, 419, 617, 1799, 3227, 6017, 12957, 141227
OFFSET
1,1
PROG
(PARI) is(n)=ispseudoprime(109*2^n-1) \\ Charles R Greathouse IV, Jun 13 2017
CROSSREFS
Sequence in context: A006691 A304312 A361066 * A266128 A183439 A296017
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