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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 7387c8f97b
commit cb5bb5e222
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Task/Lucas-Lehmer-test/Clojure/lucas-lehmer-test.clj Normal file
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(defn prime? [i]
(cond (< i 4) (>= i 2)
(zero? (rem i 2)) false
:else (not-any? #(zero? (rem i %)) (range 3 (inc (Math/sqrt i))))))))
(defn mersenne? [p] (or (= p 2)
(let [mp (dec (bit-shift-left 1 p))]
(loop [n 3 s 4]
(if (> n p)
(zero? s)
(recur (inc n) (rem (- (* s s) 2) mp)))))))
(filter mersenne? (filter prime? (iterate inc 1)))