math_fact: 2685 is a value of n for which s(n) = s(n+1).
trivia: 2685 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: May 8th is the day in 1924 that the Klaipėda Convention is signed formally incorporating Klaipėda Region (Memel Territory) into Lithuania.