MathSciNet bibliographic data MR1899242 11N37 (11N56) Luca, Florian; Pomerance, Carl On some problems of Mąkowski-Schinzel and Erdős concerning the arithmetical functions $\phi$$\phi$ and $\sigma$$\sigma$. Colloq. Math. 92 (2002), no. 1, 111–130. Article

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