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Erdős problem 298

Does every set A⊆NA \subseteq \mathbb{N} of positive density contain some finite S⊂AS \subset A such that ∑n∈S1n=1\sum_{n \in S} \frac{1}{n} = 1?
Retained from Formal Conjectures · not edited here
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Accepted in Vela Mathematics Program

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