Abundant odd numbers: Difference between revisions
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An [[wp:Abundant_number|Abundant number]] is a number n for which the sum of divisors '''σ(n) > 2n''', or, equivalently, the sum of proper divisors (or aliquot sum) '''s(n) > n'''.
E.G. 12 is abundant, it has the proper divisors '''1,2,3,4 & 6''' which sum to '''16''' ( > '''12''' or '''n'''); or alternately, has the sigma sum of '''1,2,3,4,6 & 12''' which sum to '''28''' ( > '''24''' or '''2n''' ).
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