Invitation: celebrating 50 years of OEIS, 250000 sequences, and Sloane's 75th, there will be a conference at DIMACS, Rutgers, Oct 9-10 2014.
1,1
Table of n, a(n) for n=1..16.
Index entries for sequences of n such that k*2^n-1 (or k*2^n+1) is prime
For more terms see A002256.
Sequence in context: A158293 A107579 A245381 * A053685 A244111 A136063
Adjacent sequences: A050525 A050526 A050527 * A050529 A050530 A050531
nonn
N. J. A. Sloane, Dec 29 1999
approved