A050904 Numbers n such that 291*2^n-1 is prime.

2, 5, 9, 11, 17, 21, 29, 30, 33, 50, 59, 62, 137, 161, 281, 290, 533, 842, 1410, 1553, 4794, 5529, 5661, 7013, 7470, 19605, 63477, 72513, 152942, 201494, 220562, 236117, 291705, 313433, 372342, 386430, 389225, 531347, 565917, 810347, 832410

Offset

1,1

Links

Table of n, a(n) for n=1..41.

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(291*2^n-1) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

Sequence in context: A329791 A189522 A210510 * A263637 A347305 A343878

Adjacent sequences: A050901 A050902 A050903 * A050905 A050906 A050907

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