A032388 Numbers k such that 77*2^k+1 is prime.

3, 7, 19, 23, 95, 287, 483, 559, 655, 667, 1639, 9399, 39639, 63883, 71575, 164319, 401947, 614995

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(77*2^n+1) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

Sequence in context: A018432 A205302 A127925 * A050866 A226923 A001985

Adjacent sequences: A032385 A032386 A032387 * A032389 A032390 A032391

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

Status

approved