A032425 Numbers k such that 151*2^k+1 is prime.

4, 20, 24, 76, 96, 544, 560, 1124, 1760, 5056, 6104, 9680, 31416, 84640, 281244, 301056, 585044, 809716, 858640, 1016600, 1376256, 2584480

Offset

1,1

Links

Table of n, a(n) for n=1..22.

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[151*2^# + 1] & ] (* Robert Price, Dec 18 2018 *)

Prog

(PARI) is(n)=ispseudoprime(151*2^n+1) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

Sequence in context: A039569 A298040 A174134 * A194045 A097251 A202070

Adjacent sequences: A032422 A032423 A032424 * A032426 A032427 A032428

Keyword

nonn,more

Author

James R. Buddenhagen

Extensions

a(15)-a(21) from the Ray Ballinger and Wilfrid Keller link by Robert Price, Dec 18 2018

a(22) from Jeppe Stig Nielsen, Mar 12 2020

Status

approved