Erdős problem 400
Erdős and Graham write that it is easy to show that always, but the best possible constant is unknown.
Sources
FormalConjectures/ErdosProblems/
400.lean
Retained formal statement
Can one show that for some constant ?
True ↔ ∀ k ≥ 2, ∃ c, Asymptotics.IsEquivalent Filter.atTop (fun x => ∑ n ∈ Finset.Icc 1 x, ↑(Erdos400.g k n)) fun x => c * ↑x * Real.log ↑xOpenStatement only, no proof