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erdos_828

Specification

Is it true that, for any $a \in \mathbb{Z}$, there are infinitely many $n$ such that $$\phi(n) | n + a$$?

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Lean 4 Statement 
theorem erdos_828 : answer(sorry) ↔ ∀ a : ℤ, Set.Infinite {n : ℕ | ↑(φ n) ∣ n + a}
ID: ErdosProblems__828__erdos_828
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