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| { size ? 1000 }: with builtins; | |
| let | |
| enumerate = genList (i: i + 1); | |
| sum = foldl' add 0; | |
| divides = n: k: n / k * k == n; | |
| factors = n: filter (divides n) (enumerate (n / 2)); | |
| perfect = n: sum (factors n) == n; | |
| in | |
| filter perfect (enumerate size) |
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