A032389 Numbers k such that 79*2^k+1 is prime.

2, 10, 46, 206, 538, 970, 1330, 1766, 2162, 20666, 73246, 121822, 134002, 314926, 537238, 812726, 1592422, 2078162

Offset

1,1

Links

Table of n, a(n) for n=1..18.

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(79*2^n+1) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

Sequence in context: A360412 A181294 A080643 * A290923 A106709 A204091

Adjacent sequences: A032386 A032387 A032388 * A032390 A032391 A032392

Keyword

nonn,hard

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(17) from http://www.prothsearch.com/riesel1.html by Robert Price, Dec 14 2018

Status

approved