A050579 Numbers n such that 107*2^n-1 is prime.

10, 12, 18, 24, 28, 40, 90, 132, 214, 238, 322, 532, 858, 940, 2044, 5316, 6232, 7074, 8316, 15868, 45838, 46828, 48384, 50862, 57000, 69972, 153552, 162502, 267916, 306334, 471382, 494896

Offset

1,1

Links

Table of n, a(n) for n=1..32.

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(107*2^n-1) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

Sequence in context: A144363 A051247 A242335 * A255845 A330971 A135988

Adjacent sequences: A050576 A050577 A050578 * A050580 A050581 A050582

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