9 lines
253 B
Scheme
9 lines
253 B
Scheme
(load "goof.scm")
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(define (erathostenes n)
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(define vec (make-vector n #t))
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(loop/list ((:for i (up-from 2 (to n)))
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(:when (vector-ref vec i)))
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(loop ((:for j (up-from (* 2 i) (to n) (by i))))
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(vector-set! vec j #f))
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i))
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