1,1

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

See A001770 for more terms.

Sequence in context: A139941 A127270 A053665 this_sequence A071633 A044206 A044587

Adjacent sequences: A050519 A050520 A050521 this_sequence A050523 A050524 A050525

nonn,nice

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