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A318603
Numbers k such that 471*2^k+1 is prime.
1
3, 4, 5, 7, 8, 11, 17, 20, 36, 40, 43, 47, 53, 71, 107, 123, 225, 345, 368, 460, 468, 625, 652, 807, 1036, 1107, 1285, 1531, 1613, 1820, 1837, 2084, 2195, 3512, 3604, 4427, 6273, 6945, 7112, 8615, 9223, 9564, 12265, 22697, 23895, 26435, 26492, 31313, 35297
OFFSET
1,1
MATHEMATICA
Select[Range[1000], PrimeQ[471*2^# + 1] &]
CROSSREFS
Sequence in context: A057201 A242965 A266796 * A154571 A174269 A112882
KEYWORD
nonn,hard
AUTHOR
Robert Price, Jan 07 2019
STATUS
approved