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A050887
Numbers n such that 257*2^n-1 is prime.
0
4, 6, 10, 16, 24, 60, 66, 82, 184, 256, 324, 424, 632, 756, 814, 872, 1114, 1702, 3282, 3420, 3862, 3864, 4162, 4510, 7030, 8410, 47974, 59236, 61084, 78034, 133980, 194312, 286832, 541402
OFFSET
1,1
PROG
(PARI) is(n)=ispseudoprime(257*2^n-1) \\ Charles R Greathouse IV, Jun 13 2017
CROSSREFS
Sequence in context: A075637 A027689 A023501 * A078642 A032416 A283496
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