• Roughly squarefree values of the Euler and Carmichael functions 

    Banks, William David, 1964-; Luca, Florian (Polish Academy of Sciences, Institute of Mathematics, 2005)
    Let ' denote the Euler function. In this paper, we estimate the number of positive integers n ≤ x with the property that if a prime p > y divides '(n), then p2 ∤ '(n). We also give similar estimates for the Carmichael function _.