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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 7387c8f97b
commit cb5bb5e222
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Task/Prime-decomposition/ACL2/prime-decomposition.acl2 Normal file
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(include-book "arithmetic-3/top" :dir :system)
(defun prime-factors-r (n i)
(declare (xargs :mode :program))
(cond ((or (zp n) (zp (- n i)) (zp i) (< i 2) (< n 2))
(list n))
((= (mod n i) 0)
(cons i (prime-factors-r (floor n i) 2)))
(t (prime-factors-r n (1+ i)))))
(defun prime-factors (n)
(declare (xargs :mode :program))
(prime-factors-r n 2))