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Perfect numbers
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--get perfect numbers less than n main = print $ perfects 1000 sum_of_factors n = sum [x | x <- [1..n], n `mod` x == 0, x /= n] perfects n = [x | x <- [1..n], sum_of_factors x == x]
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Compilation time: 0.31 sec, absolute running time: 0.14 sec, cpu time: 0.04 sec, memory peak: 2 Mb, absolute service time: 0.67 sec
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