Definition: Convert a disfluent question to a proper question. A disfluent question is a question that has some interruptions in it while framing. A proper question is the correct form of the question without any disfluency.
Input: How did no who included 1 as the first prime number in the mid 19th century no mid-18th?

Who included 1 as the first prime number in the mid 18th century?