Not necessarily the best approach, but this works in Clojure
(defn pp? [x] (let [logx (Math/log x) range-to #(range 2 (inc %)) power? (fn [m] (when-let [k (some #(if (= x (long (Math/pow m %))) %) (range-to (/ logx (Math/log m))))] [m k]))] (some power? (range-to (Math/sqrt x)))))
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Not necessarily the best approach, but this works in Clojure