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Q51Section II (Mathematics)51 of 145

Gauss's identity ∑d∣nφ(d)=n\sum_{d\mid n}\varphi(d)=n

Let φ(n)\varphi(n) denote Euler's function. Then ∑d∣24φ(d)\sum_{d\mid24}\varphi(d) is equal to:

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