A032398 Numbers k such that 97*2^k+1 is prime.

2, 4, 14, 20, 40, 266, 400, 652, 722, 2026, 2732, 3880, 15454, 18508, 21964, 30344, 34618, 100984, 341686, 534310, 534602, 2818306, 2820650, 3833722

Offset

1,1

Links

Table of n, a(n) for n=1..24.

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(97*2^n+1) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

Sequence in context: A299488 A295401 A342605 * A245764 A032309 A008519

Adjacent sequences: A032395 A032396 A032397 * A032399 A032400 A032401

Keyword

nonn

Author

James R. Buddenhagen

Extensions

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

a(22)-a(24) from Jeppe Stig Nielsen, Dec 23 2024

Status

approved