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A050857
Numbers n such that 211*2^n-1 is prime.
0
1, 13, 23, 37, 43, 67, 83, 151, 661, 811, 3937, 5027, 5365, 9307, 11971, 60295, 89071, 89303, 262877
OFFSET
1,2
PROG
(PARI) is(n)=ispseudoprime(211*2^n-1) \\ Charles R Greathouse IV, Jun 13 2017
CROSSREFS
Sequence in context: A108794 A272721 A089777 * A089714 A070219 A046119
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