A050838 Numbers n such that 173*2^n-1 is prime.

2, 4, 6, 16, 32, 50, 76, 80, 96, 104, 162, 212, 230, 260, 480, 612, 1044, 1440, 1910, 2488, 3140, 3628, 5284, 6332, 7494, 9762, 27100, 29632, 37732, 44036, 47284, 65970, 116870, 145956, 360004, 409470, 483932, 632000, 828808

Offset

1,1

Links

Table of n, a(n) for n=1..39.

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(173*2^n-1) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

Sequence in context: A128092 A167569 A032503 * A271842 A261864 A071243

Adjacent sequences: A050835 A050836 A050837 * A050839 A050840 A050841

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