A322964 Numbers k such that 343*2^k+1 is prime.

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

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^n-1 (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 A359611

Adjacent sequences: A322961 A322962 A322963 * A322965 A322966 A322967

Keyword

nonn,more,hard

Author

Robert Price, Dec 31 2018

Status

approved