Fatto matematico: 1541 is a value of n for which f(n) = f(n-1) + f(n-2).
Trivia: 1541 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: March 20th is the day in 1964 that the precursor of the European Space Agency, ESRO (European Space Research Organization) is established per an agreement signed on June 14, 1962.