最終更新日:2025/11/20

A factorial prime is a prime number that is either one more or one less than a factorial, as with 7 = 3! + 1.

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A factorial prime is a prime number that is either one more or one less than a factorial, as with 7 = 3! + 1.

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元となった例文

階乗に1を足すか1を引いた形の素数で、例えば7 = 3! + 1がその例です。

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