A032404 Numbers k such that 109*2^k+1 is prime.

6, 14, 58, 62, 318, 1574, 2034, 26082, 96838, 103146, 235106, 1011102, 1704658, 2280194

Offset

1,1

Links

Table of n, a(n) for n=1..14.

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

Prog

(PARI) is(n)=ispseudoprime(109*2^n+1) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

Sequence in context: A200187 A107301 A118432 * A059954 A252541 A333103

Adjacent sequences: A032401 A032402 A032403 * A032405 A032406 A032407

Keyword

nonn,hard,more

Author

James R. Buddenhagen

Extensions

a(11)-a(13) from http://www.prothsearch.com/riesel1.html by Robert Price, Dec 14 2018

a(14) from Jeppe Stig Nielsen, Apr 04 2020

Status

approved