Problem

erdos:319

∀ (N : ℕ), IsGreatest {x | ∃ A, ∃ (_ : A ⊆ Finset.Icc 1 N) (_ : ∃ δ, ∑ n ∈ A, ↑↑(δ n) / ↑n = 0 ∧ ∀ A' ⊂ A, A'.Nonempty → ∑ n ∈ A', ↑↑(δ n) / ↑n ≠ 0), A.card = x} sorry

Open Current State

Declared status: open
Formalization: formalized
Subjects: number theoryunit fractions
OEIS: possible
Sources: source:erdos-problemssource:formal-conjectures
Statement: www.erdosproblems.com

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