/- Copyright 2025 The Formal Conjectures Authors. Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at https://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. -/ import FormalConjecturesUtil

Erdős Problem 943

Reference: erdosproblems.com/943

open AdditiveCombinatorics Nat Filter namespace Erdos943

Let $A$ be the set of powerful numbers. Is is true that $1_A\ast 1_A(n)=n^{o(1)}$ for every $n$?

@[category research open, AMS 11] theorem declaration uses 'sorry'erdos_943 : answer(sorry) (o : ), o =o[atTop] (1 : ) ∀ᶠ n in atTop, (sumRep Powerful n) (n : )^(o n) := True o, o =o[atTop] 1 ∀ᶠ (n : ) in atTop, (sumRep Powerful n) n ^ o n All goals completed! 🐙 end Erdos943