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A032466 Numbers k such that 179*2^k+1 is prime. 0
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, 1457415 (list; graph; refs; listen; history; text; internal format)
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

Table of n, a(n) for n=1..43.

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 A186302

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

STATUS

approved

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Last modified November 14 17:22 EST 2019. Contains 329126 sequences. (Running on oeis4.)