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A323194
Numbers k such that 449*2^k+1 is prime.
0
3, 5, 17, 25, 53, 65, 75, 93, 227, 263, 265, 455, 627, 805, 1187, 1253, 3345, 6377, 11465, 11977, 12317, 25097, 34683, 42097, 113387, 139585, 186287, 214323, 1093035
OFFSET
1,1
MATHEMATICA
Select[Range[1000], PrimeQ[449*2^# + 1] &]
CROSSREFS
Sequence in context: A255401 A364959 A263811 * A024867 A025111 A253204
KEYWORD
nonn,more,hard
AUTHOR
Robert Price, Jan 06 2019
STATUS
approved