general_fact: 5118 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 5118 is the maximum value of n so that there exist 6 denominations of stamps so that every postage from 1 to n can be paid for with at most 12 stamps.
trivia: 5118 is an unremarkable number.
historical_date: January 4th is the day in 1998 that a massive ice storm hits eastern Canada and the northeastern United States, continuing through January 10 and causing widespread destruction.