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A050853
Numbers n such that 203*2^n-1 is prime.
0
2, 22, 82, 142, 190, 232, 314, 1682, 2302, 5598, 6632, 6720, 11080, 22094, 31310, 53088, 105890, 115350, 235480, 248862, 313474, 455190, 480918
OFFSET
1,1
PROG
(PARI) is(n)=ispseudoprime(203*2^n-1) \\ Charles R Greathouse IV, Jun 13 2017
CROSSREFS
Sequence in context: A226406 A226335 A123061 * A291915 A172229 A212894
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