A032466 Numbers k such that 179*2^k+1 is prime.

1, 3, 11, 15, 19, 35, 39, 51, 63, 111, 113, 163, 419, 633, 665, 1511, 1903, 2335, 3063, 3459, 3623, 3655, 4519, 7855, 10219, 13881, 17063, 20783, 20833, 39665, 55711, 91471, 150905, 165193, 168715, 172575, 179171, 429871, 548291, 623635, 1082249, 1224019

Offset

1,2

Comments

The subsequence of prime values starts 3, 11, 19, 113, 163, 419, 1511, 3623, 4519, 55711, 548291, ... - Muniru A Asiru, Apr 28 2019

Links

Jeppe Stig Nielsen, Table of n, a(n) for n = 1..44

Ray Ballinger, Proth Search Page

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

Maple

select(k->isprime(179*2^k+1), [$0..1000]); # Muniru A Asiru, Dec 18 2018

Mathematica

Select[Range[1000], PrimeQ[179*2^# + 1] & ] (* Robert Price, Dec 18 2018 *)

Prog

(PARI) is(n)=ispseudoprime(179*2^n+1) \\ Charles R Greathouse IV, Jun 13 2017
(Magma) [n: n in [1..5000] |IsPrime(179*2^n+1)]; // Vincenzo Librandi, Dec 19 2018

Crossrefs

Sequence in context: A075330 A131323 A050592 * A060698 A294690 A331831

Adjacent sequences: A032463 A032464 A032465 * A032467 A032468 A032469

Keyword

nonn,hard

Author

N. J. A. Sloane.

Extensions

a(33)-a(43) from the Ray Ballinger and Wilfrid Keller link by Robert Price, Dec 18 2018

Term moved from Data section to b-file, and new term added to b-file, by Jeppe Stig Nielsen, Apr 04 2020

Status

approved