Fait mathématique: 1735 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Culture générale: 1735 is an unremarkable number.
Date historique: September 30th is the day in 1791 that the first performance of The Magic Flute, the last opera by Mozart to make its debut, took place at Freihaus-Theater auf der Wieden in Vienna, Austria.