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declared proved (Lean) · formalizederdos:283
True ↔ ∀ (p : Polynomial ℤ), Erdos283.Condition p
number theoryunit fractionsA3807916 sources
declared open · formalizederdos:306
If a/b∈Q>0a/b \in \mathbb{Q}_{>0} and bb is squarefree, can a/ba/b always be written as a finite sum of reciprocals of distinct products of two distinct primes?
number theoryunit fractionsN/A4 sources
declared solvederdos:320
Let S(N)S(N) count the distinct values of ∑n∈A1/n\sum_{n\in A} 1/n over A⊆{1,…,N}A\subseteq\{1,\dots,N\}. Estimate S(N)S(N).
number theoryunit fractionsA0722072 sources
declared solved · formalizederdos:321
What is the largest A⊆{1,…,N}A\subseteq\{1,\dots,N\} such that all subset sums ∑n∈S1/n\sum_{n\in S}1/n (over S⊆AS\subseteq A) are distinct?
number theoryunit fractionsA384927 · A3915923 sources

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