Fait mathématique: 5755 is the sum of the digits of the 19^{th} Mersenne prime.
Culture générale: 5755 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Date historique: October 3rd is the day in 1908 that the Pravda newspaper is founded by Leon Trotsky, Adolph Joffe, Matvey Skobelev and other Russian exiles in Vienna.