1,2

Sum_{k>=1} 1/(k*2^k) = ln(2).

Cf. A068565.

Sequence in context: A007572 A095998 A099612 this_sequence A046270 A139207 A137237

Adjacent sequences: A068563 A068564 A068565 this_sequence A068567 A068568 A068569

easy,frac,nonn

Benoit Cloitre (benoit7848c(AT)orange.fr), Mar 25 2002