1,1

Index entries for sequences of n such that k*2^n-1 (or k*2^n+1) is prime

See A002236 for more terms.

Sequence in context: A141959 A069496 A047978 this_sequence A087514 A119625 A130748

Adjacent sequences: A050521 A050522 A050523 this_sequence A050525 A050526 A050527

nonn,nice

N. J. A. Sloane (njas(AT)research.att.com), Dec 29 1999