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Jul 1st, 2018
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Lisp 0.13 KB | None | 0 0
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  1. (defun prime? (x &optional (n 0))
  2.    (if (<= n x)
  3.       (if (not (mod x n))
  4.          (prime? x (n + 1))
  5.         true)
  6.      false))
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