Fait mathématique: 4143 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Culture générale: 4143 is an uninteresting number.
Date historique: May 5th is the day in 1941 that Emperor Haile Selassie returns to Addis Ababa, Ethiopia; the country commemorates the date as Liberation Day or Patriots' Victory Day.