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A323009
Numbers k such that 369*2^k+1 is prime.
0
1, 3, 13, 39, 61, 99, 111, 121, 142, 385, 1753, 2203, 2581, 3603, 8674, 10507, 13815, 19231, 49255, 53593, 56754, 73849, 98655, 100710, 171001, 241359, 423535, 617047, 623979, 1209435, 1240510, 2093022, 2846547
OFFSET
1,2
MATHEMATICA
Select[Range[1000], PrimeQ[369*2^# + 1] &] (* Robert Price, Jan 01 2019 *)
CROSSREFS
Sequence in context: A277411 A054975 A072790 * A328703 A166911 A103657
KEYWORD
nonn,more,hard
AUTHOR
Robert Price, Jan 01 2019
EXTENSIONS
a(32)-a(33) from Jeppe Stig Nielsen, Feb 16 2020
STATUS
approved