Perfect Numbers
| Difficulty: |
Medium |
| Topics: |
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A number is "perfect" if the sum of its divisors equal the number itself. 6 is a perfect number because 1+2+3=6. Write a function which returns true for perfect numbers and false otherwise.
(= (__ 6) true)
(= (__ 7) false)
(= (__ 496) true)
(= (__ 500) false)
(= (__ 8128) true)
解长度：47
#(= (apply + (for [i (range 1 %) :when (= 0 (mod % i))] i)) %)
[4Clojure]解题记录-#80
原文：http://www.cnblogs.com/zjfu/p/4135915.html
