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A323044
Numbers k such that 399*2^k+1 is prime.
1
2, 6, 11, 14, 15, 42, 59, 66, 75, 91, 102, 126, 131, 195, 795, 811, 1410, 1631, 2219, 2259, 2394, 2971, 3811, 5742, 8725, 8822, 10950, 11870, 15895, 16350, 24731, 27819, 29669, 30151, 42499, 43899, 57134, 59759, 77622, 78675, 78735, 81739, 87379, 127975
OFFSET
1,1
LINKS
Jeppe Stig Nielsen, Table of n, a(n) for n = 1..51 (terms n = 1..48 from Robert Price)
Ray Ballinger, Proth Search Page
Ray Ballinger and Wilfrid Keller, List of primes k*.2^n + 1 for 300 < k < 600
Eric Weisstein's World of Mathematics, Proth Prime
MAPLE
select(k->isprime(399*2^k+1), [$1..1000]); # Muniru A Asiru, Jan 03 2019
MATHEMATICA
Select[Range[1000], PrimeQ[399*2^# + 1] &]
CROSSREFS
Sequence in context: A228061 A357776 A191772 * A057976 A140486 A138327
KEYWORD
nonn,hard
AUTHOR
Robert Price, Jan 03 2019
STATUS
approved