The sum over divisors of the Euler function equals $$\sum_{d\mid n}\phi(d)=n.$$
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| created: 2016-09-08 09:18:32 | modified: 2019-04-07 06:13:48 | by: guest | references: [1272]
[1272] Landau, Edmund: “Vorlesungen über Zahlentheorie, Aus der Elementaren Zahlentheorie”, S. Hirzel, Leipzig, 1927