A032414 Numbers k such that 129*2^k+1 is prime.

3, 5, 21, 27, 59, 75, 111, 287, 414, 786, 966, 1071, 2433, 2817, 3165, 4958, 5895, 12450, 39399, 50019, 57386, 72599, 75866, 82026, 112497, 268271, 284975, 478538, 564990, 630843, 739023, 851306, 872765, 1774709, 1956915, 2255199, 3218214, 3328805, 5453363

Offset

1,1

Links

Table of n, a(n) for n=1..39.

Ray Ballinger, Proth Search Page

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

Y. Gallot, Proth.exe: Windows Program for Finding Large Primes

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[1000], PrimeQ[129*2^# + 1] & ] (* Robert Price, Dec 17 2018 *)

Prog

(PARI) is(n)=ispseudoprime(129*2^n+1) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

Sequence in context: A086175 A065926 A128561 * A062225 A288152 A082699

Adjacent sequences: A032411 A032412 A032413 * A032415 A032416 A032417

Keyword

nonn,more

Author

James R. Buddenhagen

Extensions

Extended by Hugo Pfoertner, Jul 02 2003

a(26)-a(35) from the Ray Ballinger and Wilfrid Keller link by Robert Price, Dec 17 2018

a(36) from Jeppe Stig Nielsen, Apr 19 2020

a(37)-a(39) from Jeppe Stig Nielsen, Dec 23 2024

Status

approved