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Merge branch 'master' of https://github.com/HackspaceJena/project-euler

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ikselven 2017-08-08 23:15:05 +02:00
commit ed772e7550
1 changed files with 5 additions and 3 deletions
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e0003/euler0003.rkt
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@ -1,10 +1,12 @@
#lang racket
#lang typed/racket
(require math/number-theory)
(: max-prime-factor (-> Integer (U False Integer)))
(define (max-prime-factor x)
(if (prime? x) x
(for/or ((i (filter prime? (range 2 (sqrt x)))))
(if (zero? (remainder x i)) (max-prime-factor (quotient x i)) #f))))
(for/or ((i (filter prime? (range 2 (ceiling (assert (sqrt x) real?)))))
#:when (zero? (remainder x i)))
(max-prime-factor (quotient x i)))))
(max-prime-factor 600851475143)