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A032494
Numbers k such that 235*2^k+1 is prime.
0
2, 4, 8, 10, 12, 14, 20, 22, 24, 32, 56, 76, 84, 86, 92, 118, 164, 382, 604, 1148, 1900, 2440, 2554, 2798, 3160, 6092, 7142, 14044, 14782, 21056, 24852, 29084, 44252, 46022, 101318, 294216, 412366, 493738, 769740, 923728, 1206136, 1596836, 2023486
OFFSET
1,1
MATHEMATICA
Select[Range[1000], PrimeQ[235*2^# + 1] & ] (* Robert Price, Dec 19 2018 *)
PROG
(PARI) is(n)=ispseudoprime(235*2^n+1) \\ Charles R Greathouse IV, Jun 13 2017
CROSSREFS
Sequence in context: A132190 A155037 A001770 * A125953 A373490 A308357
KEYWORD
nonn,hard,more
AUTHOR
EXTENSIONS
a(36)-a(42) from the Ray Ballinger and Wilfrid Keller link by Robert Price, Dec 19 2018
a(43) from Jeppe Stig Nielsen, May 31 2020
STATUS
approved