

A032356


Numbers n such that 13*2^n+1 is prime.


3



2, 8, 10, 20, 28, 82, 188, 308, 316, 1000, 28280, 38008, 43856, 88018, 109258, 114296, 521306, 562456, 684560, 1038896, 1499876, 1861732
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OFFSET

1,1


LINKS

Table of n, a(n) for n=1..22.
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^n1 (or k*2^n+1) is prime


PROG

(PARI) is(n)=ispseudoprime(13*2^n+1) \\ Charles R Greathouse IV, May 22 2017


CROSSREFS

Cf. A002257.
Sequence in context: A195582 A071388 A209202 * A114272 A193266 A108468
Adjacent sequences: A032353 A032354 A032355 * A032357 A032358 A032359


KEYWORD

nonn,hard,more


AUTHOR

James R. Buddenhagen


EXTENSIONS

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


STATUS

approved



