1. 紀元前より考察されている対象であるにもかかわらず、偶数の完全数が無数に存在するか、奇数の完全数は存在するか、末尾が6か8以外の完全数は存在するか、という問題は未解決である。
    – 完全数 - Wikipedia

    1 month ago  /  19 notes  /  Source: Wikipedia

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