Mean Values and Normal Order of a Successive-Iterate Ratio of Dedekind's Arithmetic Function

We obtain asymptotic formulas for the three sums \[ \sum_{n\le x}\frac{ψ(ψ(n))}{ψ(n)},\qquad \sum_{n\le x}\frac{ψ(n)}{ψ(ψ(n))},\qquad \sum_{n\le x}\log\frac{ψ(ψ(n))}{ψ(n)}, \] where \(ψ\) denotes Dedekind's arithmetic function. We also determine the normal order of the successive-iterate ratio; more