A085199 Inverse function of N -> N injection A071156.

0, 1, 0, 2, 0, 3, 0, 0, 0, 4, 0, 5, 0, 0, 0, 6, 0, 7, 0, 0, 0, 0, 0, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 9, 0, 10, 0, 0, 0, 11, 0, 12, 0, 0, 0, 0, 0, 13, 0, 0, 0, 0, 0, 0, 0, 0, 0, 14, 0, 15, 0, 0, 0, 16, 0, 17, 0, 0, 0, 0, 0, 18, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 19, 0, 20, 0, 0, 0, 0, 0, 21, 0, 0, 0

Offset: 0

Author

Antti Karttunen, Jun 14 2003

Keywords

• nonn

Comments

a(0)=0 because A071156(0)=0, but a(n) = 0 also for those n which do not occur as values of A071156. All positive natural numbers occur here once.

Crossrefs

a(A071156(n)) = n for all n.

Formula

a(n) = A057164(A085200(n)).