Erdős Problem #312 — Does there exist some c>0c>0 such that, for any K>1K>1, whenever AA is a sufficiently large finite multiset of positive integers with ∑n∈A1n>K\sum_{n\in A}\frac{1}{n}>K there exists some S⊆AS\subseteq A such…

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Does there exist some c>0c>0 such that, for any K>1K>1, whenever AA is a sufficiently large finite multiset of positive integers with ∑n∈A1n>K\sum_{n\in A}\frac{1}{n}>K there exists some S⊆AS\subseteq A such that 1−e−cK<∑n∈S1n≤1?1-e^{-cK} < \sum_{n\in S}\frac{1}{n}\leq 1?

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