1,3

a(A097687(n))=n and a(m)<n for m < A097687(n);

A097688(n) = #{k: a(k)=1, 1<=k<=n}.

Table of n, a(n) for n=1..93.

Cf. A001221.

Sequence in context: A265144 A263275 A308057 * A082666 A057938 A144623

Adjacent sequences: A097683 A097684 A097685 * A097687 A097688 A097689

nonn

Reinhard Zumkeller, Aug 19 2004

approved