https://www.whitman.edu/mathematics/higher_math_online/section03.08.html
If 𝑝� is a prime and 𝑎� is a positive integer, then
𝜙(𝑝^𝑎)=𝑝^𝑎−𝑝^(𝑎−1)
https://www.whitman.edu/mathematics/higher_math_online/section03.08.html
If 𝑝� is a prime and 𝑎� is a positive integer, then
𝜙(𝑝^𝑎)=𝑝^𝑎−𝑝^(𝑎−1)
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