Skip to content

Erdős problem 288

Is it true that there are only finitely many pairs of intervals I1I_1, I2I_2 such that ∑n1∈I11n1+∑n2∈I21n2∈N? \sum_{n_1 \in I_1} \frac{1}{n_1} + \sum_{n_2 \in I_2} \frac{1}{n_2} \in \mathbb{N}?

Sources

The source's own material, retained exactly.

4 retained statements36c6d0fef71a

Open selected source

FormalConjectures/ErdosProblems/

288.lean

Retained formal statement4 of 4

It is perhaps true with two intervals replaced by any kk intervals.

FormalConjectures/ErdosProblems/288.leanErdos288.erdos_288.variants.k_intervals3 linesExact file
sorry ↔  ∀ (k : ℕ),    {I | ∀ (j : Fin k), (I j).1 ≤ (I j).2 ∧ ∃ n, ∑ j, ∑ nⱼ ∈ (Set.Icc (I j).1 (I j).2).toFinset, (↑↑nⱼ)⁻¹ = ↑↑n}.Finite
OpenStatement only, no proof