A050905 Numbers n such that 293*2^n-1 is prime.

2, 26, 34, 66, 124, 560, 600, 1344, 1714, 1904, 5200, 7602, 10344, 63484, 196258, 213346, 243698, 421330, 517242

Offset

1,1

Links

Table of n, a(n) for n=1..19.

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(293*2^n-1) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

Sequence in context: A022375 A072663 A276176 * A067571 A319486 A084298

Adjacent sequences: A050902 A050903 A050904 * A050906 A050907 A050908

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