1,2

Table of n, a(n) for n=1..68.

a(n)=A071830(n), n>1. [From R. J. Mathar, Sep 11 2008]

Cf. A006530.

Sequence in context: A071537 A161396 A145256 * A071830 A276982 A167146

Adjacent sequences: A087786 A087787 A087788 * A087790 A087791 A087792

nonn

Reinhard Zumkeller, Oct 07 2003

approved