Fatto generale: 1756 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 1756 is the number of ways to stack 28 boxes in a line so that each box lies on the table or on a box next to 2 boxes.
Trivia: 1756 is a boring number.
Data storica: October 21st is the day in 1987 that Jaffna hospital massacre is carried out by Indian Peace Keeping Force in Sri Lanka killing 70 ethnic Tamil patients, doctors and nurses.