math_fact: 17613 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
trivia: 17613 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: March 21st is the day in 1925 that Syngman Rhee is removed from office after being impeached as the President of the Provisional Government of the Republic of Korea.