かんぜんすう
完全数
1. perfect number
2. Perfect numberIn number theory, a perfect number is a positive integer that is equal to the sum of its proper positive divisors, that is, the sum of its positive divisors excluding the number itself (also known as its aliquot sum). Equivalently, a perfect number is a number that is half the sum of all of its positive divisors (including itself) i.e. σ1(n) = 2n.
Read “Perfect number” on English Wikipedia
Read “完全数” on Japanese Wikipedia
Read “Perfect number” on DBpedia
Read “Perfect number” on English Wikipedia
Read “完全数” on Japanese Wikipedia
Read “Perfect number” on DBpedia
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