A322963 Numbers k such that 341*2^k+1 is prime.

1, 3, 7, 19, 21, 33, 43, 99, 183, 235, 499, 579, 1137, 1225, 1941, 1987, 2409, 3285, 9093, 9121, 11043, 14997, 17919, 31543, 57163, 83595, 127915, 129199, 220651, 384961, 1255881, 1325277, 1728697

Offset

1,2

Links

Table of n, a(n) for n=1..33.

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(341*2^n+1), [$1..1000]); # Muniru A Asiru, Dec 31 2018

Mathematica

Select[Range[1000], PrimeQ[341*2^# + 1] &] (* Robert Price, Dec 31 2018 *)

Crossrefs

Cf. A002255, A050527.

Sequence in context: A032667 A109991 A248219 * A018432 A205302 A127925

Adjacent sequences: A322960 A322961 A322962 * A322964 A322965 A322966

Keyword

nonn,more,hard

Author

Robert Price, Dec 31 2018

Status

approved