Fait mathématique: 15203 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Culture générale: 15203 is an uninteresting number.
Date historique: August 15th is the day in 1999 that Beni Ounif massacre in Algeria; some 29 people are killed at a false roadblock near the Moroccan border, leading to temporary tensions with Morocco.