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Erdős problem / erdos

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Problem 398

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  1. vf_3f05a64e59ce3a37

    theoretical

    Erdős Problem #398 [status: falsifiable; formalized: yes]. Are the only solutions ton!=x2−1n!=x^2-1when n=4,5,7n=4,5,7? Prize: no. OEIS: A141399, A146968. Tags: factorials, number theory.

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