Fait mathématique: 7746 is the number permutations of {1,2,3,...,21} where adjacent numbers differ by no more than 2.
Culture générale: 7746 is an uninteresting number.
Date historique: March 16th is the day in 1812 that Battle of Badajoz (March 16 – April 6) – British and Portuguese forces besieged and defeated French garrison during Peninsular War.