1,2

A variant of A141586, which is a subsequence.

Table of n, a(n) for n=1..75.

Cf. A141586, A135130, A143720.

Sequence in context: A031492 A035060 A231272 * A078779 A047593 A181046

Adjacent sequences: A143716 A143717 A143718 * A143720 A143721 A143722

nonn

N. J. A. Sloane, Nov 29 2008

approved