A032401 Numbers k such that 103*2^k+1 is prime.

16, 18, 30, 40, 58, 138, 250, 616, 622, 736, 3670, 6550, 8454, 12418, 18520, 21762, 26704, 103048, 109888, 131394, 419416, 1001214, 2093350, 2128242, 2234536

Offset

1,1

Links

Table of n, a(n) for n=1..25.

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(103*2^n+1) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

Sequence in context: A178110 A117100 A101848 * A335223 A334453 A335243

Adjacent sequences: A032398 A032399 A032400 * A032402 A032403 A032404

Keyword

nonn

Author

James R. Buddenhagen

Extensions

Extended by Hugo Pfoertner, Jul 02 2003

More terms (from http://web.archive.org/web/20161028080239/http://www.prothsearch.net/riesel.html), Joerg Arndt, Apr 07 2013

a(23) from http://www.prothsearch.com/riesel1.html by Robert Price, Dec 14 2018

a(24)-a(25) from Jeppe Stig Nielsen, Apr 19 2020

Status

approved