

A032380


Numbers k such that 61*2^k + 1 is prime.


0




OFFSET

1,1


LINKS

Table of n, a(n) for n=1..8.
Ray Ballinger, Proth Search Page
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^n1 (or k*2^n+1) is prime


PROG

(MAGMA) [n: n in [1..3500] IsPrime(61*2^n + 1)] // Vincenzo Librandi, Nov 20 2010
(PARI) is(n)=ispseudoprime(61*2^n+1) \\ Charles R Greathouse IV, Jun 13 2017


CROSSREFS

Sequence in context: A035310 A022016 A151441 * A057346 A255230 A253087
Adjacent sequences: A032377 A032378 A032379 * A032381 A032382 A032383


KEYWORD

nonn,hard


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


STATUS

approved



