login
A323004
Numbers k such that 359*2^k+1 is prime.
0
1, 5, 7, 9, 47, 55, 65, 69, 97, 103, 273, 1231, 1721, 2277, 3981, 4125, 4569, 5135, 8327, 8593, 24249, 37609, 396617, 633247, 920709, 2165551, 2870935
OFFSET
1,2
MATHEMATICA
Select[Range[1000], PrimeQ[359*2^# + 1] &] (* Robert Price, Jan 01 2019 *)
CROSSREFS
Sequence in context: A050113 A050888 A366312 * A264349 A320114 A364284
KEYWORD
nonn,more,hard
AUTHOR
Robert Price, Jan 01 2019
EXTENSIONS
a(26) from Jeppe Stig Nielsen, Apr 19 2020
a(27) from Jeppe Stig Nielsen, Aug 05 2020
STATUS
approved