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A050591
Numbers n such that 131*2^n-1 is prime.
0
2, 14, 34, 38, 42, 78, 90, 178, 778, 974, 1878, 3718, 4050, 5466, 6478, 35662, 40046, 56346, 98626, 131026, 138658
OFFSET
1,1
COMMENTS
Also in the sequence: 603738 - Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 02 2008
PROG
(PARI) is(n)=ispseudoprime(131*2^n-1) \\ Charles R Greathouse IV, Jun 13 2017
CROSSREFS
Sequence in context: A368628 A282036 A373817 * A073535 A225292 A060626
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