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A320338
Numbers k such that 481*2^k+1 is prime.
0
64, 196, 2164, 2956, 110748, 1263444, 1593660, 2201148
OFFSET
1,1
MATHEMATICA
Select[Range[1000], PrimeQ[481*2^# + 1] &]
CROSSREFS
Sequence in context: A175166 A220763 A030028 * A250135 A273321 A091077
KEYWORD
nonn,more,hard
AUTHOR
Robert Price, Jan 07 2019
EXTENSIONS
a(8) from Jeppe Stig Nielsen, Feb 25 2020
STATUS
approved