A050619 Numbers n such that 155*2^n-1 is prime.

2, 8, 14, 16, 44, 46, 82, 172, 196, 254, 556, 806, 2828, 4462, 5558, 8086, 8216, 9862, 12026, 12842, 26054, 57044, 85364, 105098, 127262, 296822, 310312, 310622, 353384, 374288, 496604

Offset

1,1

Links

Table of n, a(n) for n=1..31.

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(155*2^n-1) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

Sequence in context: A002248 A333968 A194278 * A056715 A160556 A105610

Adjacent sequences: A050616 A050617 A050618 * A050620 A050621 A050622

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