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Ingy döt Net 2023-07-01 11:58:00 -04:00
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Task/Arithmetic-Rational/Scheme/arithmetic-rational.ss Normal file
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; simply prints all the perfect numbers
(do ((candidate 2 (+ candidate 1))) ((>= candidate (expt 2 19)))
(let ((sum (/ 1 candidate)))
(do ((factor 2 (+ factor 1))) ((>= factor (sqrt candidate)))
(if (= 0 (modulo candidate factor))
(set! sum (+ sum (/ 1 factor) (/ factor candidate)))))
(if (= 1 (denominator sum))
(begin (display candidate) (newline)))))