Let φ(n) denote the Euler function. In this paper, we determine the order of growth for the number of positive integers n ≤ x for which φ(n) is the sum of two square numbers. We also obtain similar results for the Dedekind function ψ(n) and the sum of divisors function σ(n).
|Number of pages||17|
|Journal||Quarterly Journal of Mathematics|
|Publication status||Published - 2005|