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A323039
Numbers k such that 389*2^k+1 is prime.
0
11, 57, 59, 115, 299, 347, 715, 3845, 5157, 16945, 27949, 66379, 142649, 233985, 572625, 976169, 1186577, 1824385
OFFSET
1,1
MATHEMATICA
Select[Range[1000], PrimeQ[389*2^# + 1] &] (* Robert Price, Jan 03 2019 *)
CROSSREFS
Sequence in context: A201150 A114030 A071984 * A375884 A211614 A244497
KEYWORD
nonn,more,hard
AUTHOR
Robert Price, Jan 03 2019
STATUS
approved