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perf: optimize aliquot sum calculation #311

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perf: optimize aliquot sum calculation #311

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e6f1a47
perf: optimize aliquot sum calculation
oozan Jul 21, 2026
81d6a48
test: cover aliquot sum edge cases
oozan Jul 21, 2026
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13 changes: 10 additions & 3 deletions maths/aliquot_sum.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -17,10 +17,17 @@ export const aliquotSum = (num: number): number => {
if (num < 0) throw new TypeError('Input cannot be negative')
if (!Number.isInteger(num)) throw new TypeError('Input cannot be a decimal')

let sum = 0
if (num <= 1) return 0

for (let i = 1; i <= num / 2; i++) {
if (num % i === 0) sum += i
let sum = 1

for (let divisor = 2; divisor <= num / divisor; divisor++) {
if (num % divisor === 0) {
sum += divisor

const pairedDivisor = num / divisor
if (pairedDivisor !== divisor) sum += pairedDivisor
}
}

return sum
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3 changes: 3 additions & 0 deletions maths/test/aliquot_sum.test.ts
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Original file line number Diff line number Diff line change
@@ -1,6 +1,9 @@
import { aliquotSum } from '../aliquot_sum'

test.each([
[0, 0],
[1, 0],
[2, 1],
[15, 9],
[18, 21],
[28, 28],
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