9 lines
268 B
Julia
9 lines
268 B
Julia
function aliquot_sum(n)
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n <= 0 && throw(DomainError("Aliquot sum only exists for natural numbers"))
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sum([x for x in 1:div(n, 2) if mod(n, x) == 0])
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end
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isperfect(n) = aliquot_sum(n) == n
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isabundant(n) = aliquot_sum(n) > n
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isdeficient(n) = aliquot_sum(n) < n
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