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>> No.10568645 [View]
File: 4 KB, 356x112, Screenshot_2019-04-18 Euler's totient function - Wikipedia.png [View same] [iqdb] [saucenao] [google]
10568645

>>10568641
If n is a product of prime powers q_1, q_2,...,q_k then phi(n) = phi(q_1)phi(q_2)...phi(q_k)

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