1,2

a(A100112(n)) and A100113(A100112(n)) define a pair of inverse permutations of the squarefree numbers: a(A100112(A100113(n))) = A100113(A100112(a(n))) = A005117(n);

A100116(n) = if n is squarefree then a(A100112(n)) else n.

Table of n, a(n) for n=1..67.

Eric Weisstein's World of Mathematics, Squarefree

Sequence in context: A073929 A076555 A095928 * A078319 A246207 A286615

Adjacent sequences: A100111 A100112 A100113 * A100115 A100116 A100117

nonn

Reinhard Zumkeller, Nov 07 2004

approved