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+-- Smallest multiple
+
+-- Problem 5
+-- 2520 is the smallest number that can be divided by each of the numbers
+-- from 1 to 10 without any remainder.
+
+-- What is the smallest positive number that is evenly divisible by all of
+-- the numbers from 1 to 20?
+
+
+main = do
+    print (first_divisible 2520 [1..20])  -- takes 16s
+
+first_divisible :: Int -> [Int] -> Int
+first_divisible x divs
+    | divisible x divs = x
+    | otherwise = first_divisible (x + 2) divs
+
+divisible :: Int -> [Int] -> Bool
+divisible _ [] = True
+divisible x (d:divs)
+    | x `mod` d /= 0 = False
+    | otherwise = divisible x divs