Extremal orders of compositions of certain arithmetical functions
نویسندگان
چکیده
We study the exact extremal orders of compositions f(g(n)) of certain arithmetical functions, including the functions σ(n), φ(n), σ∗(n) and φ∗(n), representing the sum of divisors of n, Euler’s function and their unitary analogues, respectively. Our results complete, generalize and refine known results. Mathematics Subject Classification: 11A25, 11N37
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تاریخ انتشار 2008