A032417 Numbers k such that 135*2^k+1 is prime.

1, 2, 4, 6, 10, 15, 18, 20, 30, 31, 35, 38, 39, 51, 85, 90, 106, 108, 202, 238, 253, 282, 330, 361, 452, 459, 646, 895, 922, 1201, 1402, 1441, 1462, 1523, 1611, 1770, 1923, 2053, 2099, 2242, 2796, 7699, 10614, 11154, 11910, 14775, 17211, 17909, 18545, 23398

Offset

1,2

Links

Jeppe Stig Nielsen, Table of n, a(n) for n = 1..92 (terms n = 1..90 from Robert Price)

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[135*2^# + 1] & ] (* Robert Price, Dec 17 2018 *)

Prog

(PARI) is(n)=ispseudoprime(135*2^n+1) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

Sequence in context: A239787 A113118 A287636 * A152415 A175826 A304630

Adjacent sequences: A032414 A032415 A032416 * A032418 A032419 A032420

Keyword

nonn

Author

James R. Buddenhagen

Extensions

a(50)-a(90) from the Ray Ballinger and Wilfrid Keller link by Robert Price, Dec 17 2018

Status

approved