A050570 Numbers n such that 89*2^n-1 is prime.

4, 8, 12, 24, 48, 52, 64, 84, 96, 1272, 2028, 3224, 4952, 6892, 7372, 16476, 56968, 68632, 185868, 208824, 369628

Offset

1,1

Links

Table of n, a(n) for n=1..21.

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

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

Kosmaj, Riesel list k<300.

Prog

(PARI) is(n)=ispseudoprime(89*2^n-1) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

Sequence in context: A278602 A382327 A059992 * A335992 A394918 A233341

Adjacent sequences: A050567 A050568 A050569 * A050571 A050572 A050573

Keyword

hard,nonn

Author

N. J. A. Sloane, Dec 29 1999

Extensions

More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 02 2008

Status

approved