A050902 Numbers n such that 287*2^n-1 is prime.

4, 6, 8, 14, 16, 18, 28, 64, 114, 248, 644, 978, 1214, 1928, 1954, 3604, 4234, 6964, 7466, 12316, 14464, 35106, 92986, 525378

Offset

1,1

Links

Table of n, a(n) for n=1..24.

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(287*2^n-1) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

Sequence in context: A261680 A218465 A359676 * A320125 A110974 A173180

Adjacent sequences: A050899 A050900 A050901 * A050903 A050904 A050905

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