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A positive integer n is perfect if the sum of its positive factors, excluding itself, equals n. Write a perfect function in Haskell that takes

A positive integer n is perfect if the sum of its positive factors, excluding itself, equals n. Write a perfect function in Haskell that takes a single integer argument and returns the list of all perfect numbers up to that argument. Report all of the perfect numbers up to 1000 (i.e. call 1000)

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