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• #### Arithmetic properties of φ(n)/λ(n) and the structure of the multiplicative group modulo n ﻿

(European Mathematical Society, 2006)
For a positive integer n, we let φ(n) and λ(n) denote the Euler function and the Carmichael function, respectively. We define ξ(n) as the ratio φ(n)/λ(n) and study various arithmetic properties of ξ(n).