A032376 Numbers k such that 53*2^k+1 is prime.

1, 5, 17, 21, 61, 85, 93, 105, 133, 485, 857, 1665, 2133, 2765, 5621, 9025, 12241, 165541, 181033, 205301, 341301, 482377, 816013, 1066381, 1541133, 3709297, 4197093, 5019181

Offset

1,2

Links

Table of n, a(n) for n=1..28.

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(53*2^n+1) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

Sequence in context: A262620 A191210 A191143 * A145818 A029986 A076275

Adjacent sequences: A032373 A032374 A032375 * A032377 A032378 A032379

Keyword

nonn

Author

James R. Buddenhagen

Extensions

More terms from Hugo Pfoertner, Jun 20 2003

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

a(26)-a(28) from Jeppe Stig Nielsen, Dec 22 2024

Status

approved