Fatto matematico: 2017 is a value of n for which f(n) = f(n-1) + f(n-2).
Trivia: 2017 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: July 9th is the day in 1850 that U.S. President Zachary Taylor dies and Millard Fillmore becomes the 13th President of the United States.