倍積完全数
1. Multiply perfect numberIn mathematics, a multiply perfect number (also called multiperfect number or pluperfect number) is a generalization of a perfect number. For a given natural number k, a number n is called k-perfect (or k-fold perfect) if and only if the sum of all positive divisors of n is equal to kn; a number is thus perfect if and only if it is 2-perfect. A number that is k-perfect for a certain k is called a multiply perfect number. As of July 2004, k-perfect numbers are known for each value of k up to 11.
Read “Multiply perfect number” on English Wikipedia
Read “倍積完全数” on Japanese Wikipedia
Read “Multiply perfect number” on DBpedia
Read “Multiply perfect number” on English Wikipedia
Read “倍積完全数” on Japanese Wikipedia
Read “Multiply perfect number” on DBpedia
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