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A050582
Numbers k such that 113*2^k-1 is prime.
0
8, 14, 74, 80, 274, 334, 590, 608, 614, 650, 1016, 1814, 1904, 4400, 5474, 144866, 174898, 343214, 422866, 464386, 572966, 1389674, 1425998
OFFSET
1,1
MATHEMATICA
Select[Range[1000], PrimeQ[113*2^# - 1] & ] (* Robert Price, Dec 23 2018 *)
PROG
(PARI) is(n)=ispseudoprime(113*2^n-1) \\ Charles R Greathouse IV, Jun 13 2017
CROSSREFS
Sequence in context: A218555 A268160 A236553 * A128451 A177170 A275006
KEYWORD
hard,nonn,more
AUTHOR
N. J. A. Sloane, Dec 29 1999
EXTENSIONS
More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 02 2008
a(21)-a(23) from the Wilfrid Keller link by Robert Price, Dec 23 2018
STATUS
approved