Increasing gaps between consecutive Niven numbers: Difference between revisions
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nivens :: [Int] |
nivens :: [Int] |
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nivens = [1..] >>= \n -> guard (n `rem` digitSum n == 0) >> |
nivens = [1..] >>= \n -> guard (n `rem` digitSum n == 0) >> [n] |
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where |
where |
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digitSum = sum . unfoldr (\x -> guard (x > 0) >> pure (swap $ x `quotRem` 10)) |
digitSum = sum . unfoldr (\x -> guard (x > 0) >> pure (swap $ x `quotRem` 10)) |
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