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attention : if p is prime p^k/phi(p^k) = p^(k-1)/phi(p^(k-1))=...= p/p-1;
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Project Euler #69: Totient maximum
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attention : if p is prime p^k/phi(p^k) = p^(k-1)/phi(p^(k-1))=...= p/p-1;