准完全数(英语:quasi-perfect number),又称准完美数或准完备数,是一些特殊的自然数:它所有的非平凡因子(即除了1和自身以外的约数)的和,恰好等于它本身。准完全数是丰数。
未解决的数学问题:准完全数存在吗?
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