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erdos_321

Specification

Let $R(N)$ be the size of the largest $A\subseteq\{1, ..., N\}$ such that all sums $\sum_{n\in S} \frac{1}{n}$ are distinct for $S\subseteq A$. What is $R(N)$?

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Lean 4 Statement 
theorem erdos_321 (N : ℕ) :
    R N = answer(sorry)
ID: ErdosProblems__321__erdos_321
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