Erdős problem 939If r≥4r≥4 then can the sum of r−2r-2 coprime rr-powerful numbers ever be itself rr-powerful?WorkspaceContinue locallyOpen sourceSign in to contributeOpen this exact Problem, source revision, and authority Repository in Workbench. This handoff does not clone, switch, upload, or execute anything.FilesErdős problem 9398 retained source recordsCanvaspublic previewSource#939→ResultNone→Checks0