Mathematical fact: 76 is a Lucas number, an automorphic number, a nontotient, a 14-gonal number, and a centered pentagonal number.
Trivia: 76 is the atomic number of osmium.
Historical date: March 16th is the day in 1916 that the 7th and 10th US cavalry regiments under John J. Pershing crossed the US-Mexico border to join the hunt for Pancho Villa.