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A050834
Numbers k such that 165*2^k-1 is prime.
1
2, 3, 5, 6, 8, 11, 12, 15, 18, 23, 27, 36, 39, 44, 45, 56, 59, 63, 81, 84, 150, 188, 264, 275, 282, 299, 321, 338, 390, 552, 657, 722, 930, 1139, 1388, 1491, 1625, 2196, 2519, 2541, 2736, 2766, 3630, 4202, 4875, 5643, 6150, 10134, 20328, 20805, 22902, 25770, 30918
OFFSET
1,1
MATHEMATICA
Select[Range[1000], PrimeQ[165*2^# - 1] & ] (* Robert Price, Dec 29 2018 *)
PROG
(PARI) is(n)=ispseudoprime(165*2^n-1) \\ Charles R Greathouse IV, Jun 13 2017
CROSSREFS
Sequence in context: A005099 A161720 A105760 * A294911 A179799 A247588
KEYWORD
hard,nonn
AUTHOR
N. J. A. Sloane, Dec 29 1999
EXTENSIONS
More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 02 2008
a(54)-a(74) from the Wilfrid Keller link by Robert Price, Dec 29 2018
STATUS
approved