0,2
Cf. A008691. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Oct 18 2008]
Sequence in context: A174717 A109123 A113921 * A008691 A193141 A051964
Adjacent sequences: A047801 A047802 A047803 * A047805 A047806 A047807
nonn,easy,more
N. J. A. Sloane (njas(AT)research.att.com).