A050891 Numbers n such that 265*2^n-1 is prime.

11, 17, 19, 21, 37, 49, 59, 145, 163, 289, 587, 737, 1029, 1061, 1873, 2265, 3271, 3943, 5429, 6067, 6133, 6277, 10101, 10967, 11497, 18799, 27551, 34883, 37459, 44897, 74743, 113473, 323083

Offset

1,1

Links

Table of n, a(n) for n=1..33.

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(265*2^n-1) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

Sequence in context: A256546 A031329 A050658 * A226630 A061751 A063449

Adjacent sequences: A050888 A050889 A050890 * A050892 A050893 A050894

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