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A050571
Numbers n such that 91*2^n-1 is prime.
0
1, 3, 9, 13, 15, 17, 19, 23, 47, 57, 67, 73, 77, 81, 83, 191, 301, 321, 435, 867, 869, 917, 6009, 6051, 8077, 9003, 10355, 10719, 11217, 20197, 22011, 36379, 45373, 53441, 77013, 86329, 89853, 90341, 104783, 169779, 187407, 245989, 313849, 535819, 563469, 633169, 711335
OFFSET
1,2
PROG
(PARI) is(n)=ispseudoprime(91*2^n-1) \\ Charles R Greathouse IV, Jun 13 2017
CROSSREFS
Sequence in context: A101537 A070353 A029458 * A234286 A193927 A111230
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