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A050583
Numbers n such that 115*2^n-1 is prime.
0
1, 3, 11, 13, 19, 21, 31, 49, 59, 69, 73, 115, 129, 397, 597, 623, 769, 1131, 4581, 6229, 13477, 20995, 24541, 31089, 48535, 57375, 87151, 98543, 267443, 357829
OFFSET
1,2
PROG
(PARI) is(n)=ispseudoprime(115*2^n-1) \\ Charles R Greathouse IV, Jun 13 2017
CROSSREFS
Sequence in context: A045427 A373726 A115165 * A045428 A338445 A191049
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