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eccstartup/test_PrimeFactors.hs

Created June 2, 2016 02:06
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test_PrimeFactors.hs
module PrimeFactors where
lessFacs1 n = [k | k <- [2..(truncate (sqrt (fromInteger n)))], mod n k == 0]
lessPrimeFacs [] n = []
lessPrimeFacs (p:ps) n
| mod n p == 0 = p:(lessPrimeFacs (p:ps) (div n p))
| otherwise = lessPrimeFacs ps n
lessFacs n = lessPrimeFacs (lessFacs1 n) n
factor 1 = []
factor n
| lf == [] = [n]
| length lf == 1 = lf ++ [div n (head lf)]
| otherwise = lf
where lf = lessFacs n
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