A050576 Numbers n such that 101*2^n-1 is prime.

10, 18, 54, 70, 1330, 1638, 3894, 4114, 9990, 94194, 900358

Offset

1,1

Links

Table of n, a(n) for n=1..11.

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(101*2^n-1) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

Sequence in context: A350317 A255603 A291931 * A144376 A266708 A186235

Adjacent sequences: A050573 A050574 A050575 * A050577 A050578 A050579

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