Problem

ErdősProblems.com #848

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Claims and evidence

• The submission claims a full proof that, for every N >= 1, the maximum size of a set A subset of {1, ..., N} such that ab + 1 is nonsquarefree for every a, b in A is floor((N + 18)/25).

  2026-alexchengyuli-erdos-848 · record v1

  3 evidence3 open tasks