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A050561
Numbers n such that 71*2^n-1 is prime.
0
2, 14, 410, 1390, 3770, 5434, 202642, 735802
OFFSET
1,1
PROG
(PARI) is(n)=ispseudoprime(71*2^n-1) \\ Charles R Greathouse IV, Jun 13 2017
CROSSREFS
Sequence in context: A242876 A102596 A354465 * A346082 A135865 A337073
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