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 an unremarkable number.
Data storica: October 6th is the day in 1973 that Egypt launches a coordinated attack with Syria against Israel leading to the Yom Kippur War.