Fait mathématique: 1817 is the number of polyominoes with 8 or fewer squares.
Culture générale: 1817 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Date historique: December 21st is the day in 1937 that Snow White and the Seven Dwarfs, the world's first full-length animated feature, premieres at the Carthay Circle Theater.