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A050869
Numbers n such that 235*2^n-1 is prime.
0
3, 9, 15, 75, 143, 425, 693, 803, 903, 953, 1079, 1613, 1667, 2937, 7157, 7899, 136767, 178739, 191973, 231927, 312345, 315773, 556077
OFFSET
1,1
PROG
(PARI) is(n)=ispseudoprime(235*2^n-1) \\ Charles R Greathouse IV, Jun 13 2017
CROSSREFS
Sequence in context: A062804 A110960 A192165 * A323679 A038547 A348199
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