1,3

a(n) = A008966(n)*A073311(n);

a(A000040(n)) = A112929(n).

Table of n, a(n) for n=1..86.

Count[#, _?SquareFreeQ]&/@Table[k*n, {n, 90}, {k, n}] (* Harvey P. Dale, Sep 05 2012 *)

Sequence in context: A008807 A263149 A008819 * A231117 A021496 A241830

Adjacent sequences: A169643 A169644 A169645 * A169647 A169648 A169649

nonn

Reinhard Zumkeller, Apr 05 2010

approved