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erdos_1003

Specification

Are there infinitely many solutions to $\phi(n) = \phi(n+1)$, where $\phi$ is the Euler totient function?

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Lean 4 Statement 
theorem erdos_1003 : answer(sorry) ↔ Set.Infinite {n | φ n = φ (n + 1)}
ID: ErdosProblems__1003__erdos_1003
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