Fatto matematico: 1413 is the smallest number that can not be formed using the digits 0-7 at most once, together with the symbols + – × and ÷.
Trivia: 1413 is an uninteresting number.
Data storica: November 13th is the day in 1982 that the Vietnam Veterans Memorial is dedicated in Washington, D.C. after a march to its site by thousands of Vietnam War veterans.