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erdos_409.parts.iii

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What is the density of $n$ which reach any fixed prime under the iteration $n\mapsto\phi(n) + 1$?

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Lean 4 Statement 
theorem erdos_409.parts.iii (p : ℕ) (h : p.Prime) (α : ℝ)
    (hα : { n | ∃ i, (φ · + 1)^[i] n = p }.HasDensity α) :
    α = answer(sorry)
ID: ErdosProblems__409__erdos_409.parts.iii
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