A050617 Numbers n such that 151*2^n-1 is prime.

5, 221, 641, 2783, 6423, 9053, 23271, 29159, 88409, 113655, 241271, 263895

Offset

1,1

Links

Table of n, a(n) for n=1..12.

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(151*2^n-1) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

Sequence in context: A261945 A024070 A290179 * A066462 A046193 A195633

Adjacent sequences: A050614 A050615 A050616 * A050618 A050619 A050620

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