1. Superabundant numberIn mathematics, a superabundant number (sometimes abbreviated as SA) is a certain kind of natural number. Formally, a natural number n is called superabundant precisely when, for any m < n, where σ denotes the sum-of-divisors function (i.e. , the sum of all positive divisors of n, including n itself). The first few superabundant numbers are 1, 2, 4, 6, 12, 24, 36, 48, 60, 120, .... Superabundant numbers were defined by Leonidas Alaoglu and Paul Erdős .
Read “Superabundant number” on English Wikipedia
Read “超過剰数” on Japanese Wikipedia
Read “Superabundant number” on DBpedia
Read “Superabundant number” on English Wikipedia
Read “超過剰数” on Japanese Wikipedia
Read “Superabundant number” on DBpedia
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