A050863 Numbers n such that 223*2^n-1 is a prime.

3, 19, 91, 211, 699, 819, 1323, 4635, 38019, 307755

Offset

1,1

Links

Table of n, a(n) for n=1..10.

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 a prime

Kosmaj, Riesel list k<300.

Crossrefs

Sequence in context: A204256 A015528 A183384 * A283380 A049153 A074361

Adjacent sequences: A050860 A050861 A050862 * A050864 A050865 A050866

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