A053350 Numbers k such that 267*2^k + 1 is prime.

2, 3, 4, 12, 34, 40, 46, 70, 82, 102, 118, 119, 192, 202, 300, 434, 508, 515, 516, 612, 690, 718, 795, 846, 1112, 1786, 3884, 5112, 5136, 8628, 10218, 10222, 16415, 38796, 40642, 47318, 48134, 48634, 50778, 60134, 60282, 88088, 240778, 314228, 331154, 383172

Offset

1,1

Links

Jeppe Stig Nielsen, Table of n, a(n) for n = 1..54

Ray Ballinger and Wilfrid Keller, List of primes k.2^n + 1 for k < 300

Wilfrid Keller, List of primes k.2^n - 1 for k < 300

Index entries for sequences of n such that k*2^n-1 (or k*2^n+1) is prime

Mathematica

Select[Range[5*10^3], PrimeQ[267*2^# + 1] &] (* G. C. Greubel, May 24 2018 *)

Prog

(PARI) is(n)=ispseudoprime(267*2^n+1) \\ Charles R Greathouse IV, Jun 13 2017
(Magma) [n: n in [1..300] | IsPrime(267*2^n+1)];  // G. C. Greubel, May 24 2018

Crossrefs

Sequence in context: A236371 A333620 A173446 * A165302 A276530 A360061

Adjacent sequences: A053347 A053348 A053349 * A053351 A053352 A053353

Keyword

hard,nonn

Author

N. J. A. Sloane, Dec 29 1999

Extensions

a(43)-a(51) from the Ray Ballinger and Wilfrid Keller link by Robert Price, Dec 20 2018

Terms moved from Data section to b-file, and more terms added to b-file by Jeppe Stig Nielsen, Mar 12 2020

Status

approved