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15 lines
424 B
Kotlin
15 lines
424 B
Kotlin
fun getSumOfDivisors(n: Long): Long =
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(1 until Math.sqrt(n.toDouble()).toLong() + 1).reduce {
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acc, e -> acc + if (n.rem(e) == 0.toLong()) e + n.div(e) else 0.toLong()
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}
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fun buddy(start: Long, limit: Long): String {
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for (n in start..limit) {
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val m = getSumOfDivisors(n) - 1
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if (m > n && getSumOfDivisors(m) - 1 == n) {
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return "($n $m)"
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}
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}
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return "Nothing"
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}
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