A032372 Numbers k such that 45*2^k+1 is prime.

2, 9, 12, 14, 23, 24, 29, 60, 189, 200, 333, 372, 443, 464, 801, 1374, 6146, 6284, 6359, 6923, 12293, 16679, 18660, 19301, 29240, 32018, 38457, 48612, 56754, 67394, 76416, 79160, 91403, 97116, 110303, 129731, 159318, 202304, 243321, 426653, 458712, 574506

Offset

1,1

Links

Jeppe Stig Nielsen, Table of n, a(n) for n = 1..57

Ray Ballinger and Wilfrid Keller, List of primes k.2^n + 1 for k < 300

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^n-1 (or k*2^n+1) is prime

Prog

(PARI) is(n)=ispseudoprime(45*2^n+1) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

Sequence in context: A092191 A030376 A080520 * A207967 A265413 A297830

Adjacent sequences: A032369 A032370 A032371 * A032373 A032374 A032375

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(40) and beyond from Jeppe Stig Nielsen, Sep 19 2019

Status

approved