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On certain equations and inequalities involving the arithmetical functions φ(n) and d(n)

, Babeș-Bolyai University,

Abstract: By using the results and methods of [1], we will study the equation \varphi(n) + d(n) = \frac{n}{2} and the related inequalities. The equation \varphi(n) + d^2(n)=2n will be solved, too.
Keywords: functions / arithmetical / solved / frac / inequalities involving / equations and inequalities

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