1,2

a(A100112(n)) and A100114(A100112(n)) define a pair of inverse permutations of the squarefree numbers: a(A100112(A100114(n))) = A100114(A100112(a(n))) = A005117(n);

A100115(n) = if n is squarefree then a(A100112(n)), otherwise n.

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

Eric Weisstein's World of Mathematics, Squarefree

Sequence in context: A331441 A209664 A072647 * A300012 A302781 A303760

Adjacent sequences: A100110 A100111 A100112 * A100114 A100115 A100116

nonn

Reinhard Zumkeller, Nov 07 2004

approved