In Haskell the numerator and denominator of the Rational type are unbounded integers, so one of the (many equivalent) ways of writing it is: ghci> sum [i %

In Haskell the numerator and denominator of the Rational type are unbounded integers, so one of the (many equivalent) ways of writing it is: ghci> sum [i % (i+1) | i <- [0..9]] 17819 % 2520 ghci> % is the constructor for Rational numbers. I.e. one half is written (and shown as) 1 % 2. I'll spare people the full result, but: ghci> sum [i % (i+1) | i <- [0..999]] 70755...77483 % 71288...20000 ghci>