33 lines
787 B
Haskell
33 lines
787 B
Haskell
import Data.List (intercalate)
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import Data.List.Split (chunksOf)
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---------------------- GAPFUL NUMBERS --------------------
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isGapful :: Int -> Bool
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isGapful =
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(0 ==)
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. (<*>)
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rem
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(read . (<*>) [head, last] . pure . show)
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--------------------------- TEST -------------------------
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main :: IO ()
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main =
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mapM_
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(putStrLn . showSample)
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[ "First 30 gapful numbers >= 100",
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"First 15 Gapful numbers >= 1000000",
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"First 10 Gapful numbers >= 1000000000"
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]
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showSample :: String -> String
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showSample k =
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let ws = words k
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in k <> ":\n\n"
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<> unlines
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( fmap (intercalate ", " . fmap show) $
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chunksOf 5 $
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take
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(read (ws !! 1))
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[read (ws !! 5) :: Int ..]
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)
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