0,2

Decimal expansion of Sum_{ k >= 1} (k - 1 - PrimePi[k])/2^k.

S. M. Ulam, Problems in Modern Mathematics, John Wiley and Sons, New York, 1960, page 54

Table of n, a(n) for n=0..99.

0.17063498029777667950378075569138458326845152372416604426350917102271807...

Sequence in context: A011479 A153871 A198934 * A260799 A021590 A094241

Adjacent sequences: A119521 A119522 A119523 * A119525 A119526 A119527

nonn,cons

Roger L. Bagula, May 27 2006

Edited and corrected by N. J. A. Sloane, Nov 17 2006

approved