Problem

erdos:46

True ↔ ∀ (𝓒 : ℕ → ℕ), (Set.range 𝓒).Finite → ∃ S, (∀ n ∈ S, 2 ≤ n) ∧ ∑ n ∈ S, 1 / ↑n = 1 ∧ (𝓒 '' ↑S).Subsingleton

Open Current State

Declared status: proved (Lean)
Formalization: formalized
Subjects: number theoryunit fractionsramsey theory
OEIS: N/A
Sources: source:erdos-problemssource:formal-conjecturessource:jayyhk-erdos-leansource:plby-lean-proofs
Statement: www.erdosproblems.com

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