Evaluation effective du nombre d'entiers n tels que φ(n) ≤ x

On some generalized integers

“…In [9] a more exact version of the asymptotic formula (6) is obtained applying elementary' method: for x/> 3.…”

“…Represent Z(s) as the product (9) where The lemma is proved. We further estimate the function Z(s) for 1 ~< o, ~< 2 and to the left of the line a = 1. are supposed to be positive and may depend on r.…”