Fatto matematico: 2471 is the smallest number that can not be formed using the numbers 2^{0}, 2^{1}, ... , 2^{6}, together with the symbols +, –, × and ÷.
Trivia: 2471 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: October 6th is the day in 1979 that Pope John Paul II becomes the first pontiff to visit the White House.