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erdos_329

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**Erdős Problem 329.** Let `A ⊆ ℕ` be a Sidon set. How large can `lim sup_{N → ∞} |A ∩ {1,…,N}| / N^{1/2}` be?

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Lean 4 Statement 
theorem erdos_329 : sSup {sidonUpperDensity A | (A : Set ℕ) (_ : IsSidon A)} =
    answer(sorry)
ID: ErdosProblems__329__erdos_329
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