Abundant Numbers - LISP

Download Runnable Program

Program:

;Abundant numbers
(defun abn(n)
        (format t "<<<GENERATING ABUNDANT NUMBERS IN THE RANGE 1 TO ~D" N)
      ;; (setf sum 1)
    (do((i 1 (+ i 1))) ((= i (+ n 1)))
            (setf sum (sumd i)    dbl (* 2 i))
             (if(> sum dbl)    (print i))
    )
   
)
 
(defun sumd(n)
    (setf m (floor n 2))(setf sum 1 )
    (do((i 2(+ i 1))) ((> i m))
        (if(= (mod n i) 0)
                (setf sum (+ sum i) )
        )
       
    )
    (setf sum (+ sum n) )
    sum
)
Output:
Break 2 [4]> (load 'abn.lsp)
;; Loading file abn.lsp ...
;; Loaded file abn.lsp
T
Break 2 [4]> (abn 50)
<<<GENERATING ABUNDANT NUMBERS IN THE RANGE 1 TO 50
12
18
20
24
30
36
40
42
48
NIL
Break 2 [4]>




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