A050543 Numbers n such that 35*2^n-1 is prime.

2, 6, 10, 20, 44, 114, 146, 156, 174, 260, 306, 380, 654, 686, 702, 814, 906, 1196, 1316, 3062, 4116, 9382, 23562, 25742, 32564, 72444, 97550, 112390, 118510, 246732, 252910, 634402, 805222, 839082

Offset

1,1

Links

Table of n, a(n) for n=1..34.

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(35*2^n-1) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

Cf. A032367, 35*2^n+1 is prime.

Sequence in context: A373006 A317759 A014279 * A025588 A009325 A308346

Adjacent sequences: A050540 A050541 A050542 * A050544 A050545 A050546

Keyword

hard,nonn

Author

N. J. A. Sloane, Dec 29 1999

Extensions

More terms from Hugo Pfoertner, Sep 30 2004

More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 02 2008

Status

approved