haskell 003

haskell/euler003.hs

@@ -0,0 +1,9 @@
+module Main where
+
+primes = 2 : [i | i <- [3..],
+              and [rem i p > 0 | p <- takeWhile (\p -> p^2 <= i) primes]]
+
+primeFactors n = filter (\a -> n `mod` a == 0) (takeWhile (\m -> m * m < n) primes)
+
+main = do
+    print (last (primeFactors 600851475143))