9 lines
202 B
Clojure
9 lines
202 B
Clojure
(defn proper-divisors [n]
|
|
(if (< n 4)
|
|
[1]
|
|
(->> (range 2 (inc (quot n 2)))
|
|
(filter #(zero? (rem n %)))
|
|
(cons 1))))
|
|
|
|
(defn perfect? [n]
|
|
(= (reduce + (proper-divisors n)) n))
|