准完全數(英語:quasi-perfect number),又稱准完美數或准完備數,是一些特殊的自然數:它所有的非平凡因子(即除了1和自身以外的因數)的和,恰好等於它本身。准完全數是豐數。
未解決的數學問題:准完全數存在嗎?
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