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Problem 1073

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  1. vf_bac76c2fea1aa3e9

    theoretical

    Erdős Problem #1073: declared status 'open'. Formalized: yes. Let A(x)A(x) count the number of composite u<xu<x such that n!+1≡0(modu)n!+1\equiv 0\pmod{u} for some nn. Is it true that A(x)≤xo(1)A(x)\leq x^{o(1)}? Prize: no. OEIS: A256519. Tags: number theory.

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