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A032464
Numbers k such that 175*2^k+1 is prime.
0
2, 4, 16, 32, 34, 36, 52, 56, 82, 88, 96, 146, 268, 284, 404, 856, 1652, 3254, 3848, 4364, 5034, 9666, 11542, 14068, 18086, 19634, 21614, 23032, 45736, 57676, 62642, 97288, 111692, 113488, 133908, 242514, 502646, 695576, 814158, 862436, 1022634, 1962288
OFFSET
1,1
MATHEMATICA
Select[Range[1000], PrimeQ[175*2^# + 1] & ] (* Robert Price, Dec 18 2018 *)
PROG
(PARI) is(n)=ispseudoprime(175*2^n+1) \\ Charles R Greathouse IV, Jun 13 2017
CROSSREFS
Sequence in context: A173746 A095803 A036345 * A171381 A334083 A274497
KEYWORD
nonn,hard
AUTHOR
EXTENSIONS
a(33)-a(42) from the Ray Ballinger and Wilfrid Keller link by Robert Price, Dec 18 2018
STATUS
approved