1,2

It is not clear that each even number will appear in A073662, though I've checked it up to 20000.

Table of n, a(n) for n=1..72.

a(n) = position of (2n) in A073662: A073662(a(n)) = 2n.

a(1)=4 because 2*1=2 appears at 4th position in A073662, a(14)=14 because 2*14=28 appears at 14th position in A073662,

Cf. A073662, A073664, A076023.

Sequence in context: A095303 A060734 A075594 * A064421 A051494 A262025

Adjacent sequences: A076019 A076020 A076021 * A076023 A076024 A076025

easy,nonn

Zak Seidov, Sep 30 2002

approved