Erdős problem 28If A⊆NA ⊆ \mathbb{N} is such that A+AA + A contains all but finitely many integers then lim sup1A∗1A(n)=∞\limsup 1_A ∗ 1_A(n) = \infty.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 282 retained source recordsCanvaspublic previewSource#28→ResultNone→Checks0