18 lines
537 B
Haskell
18 lines
537 B
Haskell
-- num_reverse :: Num a -> Num a
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num_reverse = read . reverse . show
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-- num_palindrom :: Num a -> Bool
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num_palindrom n = (show n) == (reverse $ show n)
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-- lychrel :: Num a -> Num a -> Bool
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lychrel 0 n = False
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lychrel depth n = ( num_palindrom number ) || lychrel (depth - 1) number
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where number = n + (num_reverse n)
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-- nblychrel :: Num a -> Num a
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nblychrel n = length $ filter (not . lychrel 50) [1..n]
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main = do
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putStrLn $ show ( lychrel 50 196 )
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putStrLn $ show ( nblychrel n )
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where n = 10000
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