A322946 Numbers k such that 311*2^k+1 is prime.

9, 29, 35, 105, 125, 131, 179, 359, 2735, 28199, 47349, 64485, 1094135, 1171199, 1323071, 2798459

Offset

1,1

Links

Table of n, a(n) for n=1..16.

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

Mathematica

Select[Range[1000], PrimeQ[311*2^# + 1] &] (* Robert Price, Dec 31 2018 *)

Crossrefs

Cf. A002255, A050527.

Sequence in context: A044976 A002642 A032700 * A350963 A098949 A031296

Adjacent sequences: A322943 A322944 A322945 * A322947 A322948 A322949

Keyword

nonn,more,hard

Author

Robert Price, Dec 31 2018

Extensions

a(16) from Jeppe Stig Nielsen, Dec 27 2019

Status

approved