Created
January 21, 2015 12:37
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chain :: Integer -> [Integer] | |
chain 1 = [1] | |
chain n | |
| even n = n : chain (n `div` 2) | |
| odd n = n : chain (n * 3 + 1) | |
numLongChains :: Int | |
numLongChains = length (filter isLong (map chain [1..100])) | |
where isLong xs = length xs > 15 | |
main = do | |
print $ chain 10 | |
print $ numLongChains |
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