

A322964


Numbers k such that 343*2^k+1 is prime.


0



2, 20, 22, 46, 58, 226, 3760, 7060, 16192, 22018, 35576, 103952, 113326, 120716, 285122, 543148, 785510, 1033126
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OFFSET

1,1


LINKS

Table of n, a(n) for n=1..18.
Ray Ballinger, Proth Search Page
Ray Ballinger and Wilfrid Keller, List of primes k.2^n + 1 for 300 < k < 600
Y. Gallot, Proth.exe: Windows Program for Finding Large Primes
Wilfrid Keller, List of primes k.2^n  1 for k < 300
Eric Weisstein's World of Mathematics, Proth Prime
Index entries for sequences of n such that k*2^n1 (or k*2^n+1) is prime


MAPLE

select(n>isprime(343*2^n+1), [$1..1000]); # Muniru A Asiru, Dec 31 2018


MATHEMATICA

Select[Range[1000], PrimeQ[343*2^# + 1] &] (* Robert Price, Dec 31 2018 *)


CROSSREFS

Cf. A002255, A050527.
Sequence in context: A136906 A260570 A022372 * A112405 A136885 A136909
Adjacent sequences: A322961 A322962 A322963 * A322965 A322966 A322967


KEYWORD

nonn,more,hard


AUTHOR

Robert Price, Dec 31 2018


STATUS

approved



