Fait mathématique: 1737 is a value of n so that (n-1)^{2} + n^{2} + (n+1)^{2} is a palindrome.
Culture générale: 1737 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Date historique: October 2nd is the day in 1928 that the "Prelature of the Holy Cross and the Work of God", commonly known as Opus Dei, is founded by Saint Josemaría Escrivá.