A032419 Numbers k such that 139*2^k + 1 is prime.

2, 14, 914, 12614, 335522, 1567874

Offset

1,1

Links

Table of n, a(n) for n=1..6.

Ray Ballinger, Proth Search Page

Ray Ballinger & 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

Maple

select(k->isprime(139*2^k+1), [$0..1000])[]; # Muniru A Asiru, Dec 18 2018

Mathematica

Select[Range[1000], PrimeQ[139*2^# + 1] & ] (* Robert Price, Dec 18 2018 *)

Prog

(PARI) is(n)=ispseudoprime(139*2^n+1) \\ Charles R Greathouse IV, Jun 07 2017

Crossrefs

Cf. A032418, A032373, A032420, A032460, A032497.

Sequence in context: A060599 A319774 A065868 * A144017 A225163 A319540

Adjacent sequences: A032416 A032417 A032418 * A032420 A032421 A032422

Keyword

nonn,hard,more

Author

James R. Buddenhagen

Extensions

One more term (from the Ballinger-Keller web page) from M. F. Hasler, Apr 18 2007

a(6) from the Ray Ballinger and Wilfrid Keller link by Robert Price, Dec 18 2018

Status

approved