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A323144
Numbers k such that 309*2^k+1 is prime.
1
1, 2, 3, 6, 9, 21, 51, 53, 57, 67, 69, 106, 143, 163, 193, 194, 231, 338, 343, 1197, 1314, 2178, 2266, 3401, 3422, 4751, 5914, 6097, 11403, 16519, 24227, 24447, 27041, 29591, 41466, 44459, 46522, 49458, 55198, 64177, 71877, 79898, 102411, 110503, 113258
OFFSET
1,2
MAPLE
select(k->isprime(309*2^k+1), [$1..1000]); # Muniru A Asiru, Jan 05 2019
MATHEMATICA
Select[Range[1000], PrimeQ[309*2^# + 1] &]
CROSSREFS
Sequence in context: A191469 A091053 A095064 * A056353 A111274 A133385
KEYWORD
nonn,hard
AUTHOR
Robert Price, Jan 05 2019
STATUS
approved