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erdos_694.variants.carmichael

Specification

Carmichael has asked whether there is an integer $n$ for which $\phi(m) = n$ has exactly one solution, that is $\frac{f_\max(n)}{f_\min(n)} = 1$.

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Lean 4 Statement 
theorem erdos_694.variants.carmichael :
    answer(sorry) ↔ ∃ n > 0, ∃! m, Nat.totient m = n
ID: ErdosProblems__694__erdos_694.variants.carmichael
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