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  1. (progn
  2.   (defun collatz (n)
  3.     (if (evenp n)
  4.         (/ n 2)
  5.       (+ (* 3 n) 1)))
  6.  
  7.   (defun collatz-list (ls)
  8.     (if (not (listp ls))
  9.         (setq ls (cons ls ())))
  10.     (let* ((temp (collatz (car ls))))
  11.       (if (= 1 temp)
  12.           (cons temp ls)
  13.         (collatz-list (cons temp ls)))))
  14.  
  15.   (collatz-list 3))
Success #stdin #stdout 0s 3068KB
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https://ideone.com/sKxGj
language:
Clips (clips 6.30)
created:
14 years ago
visibility:
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