math_fact: 4422 is the maximum value of n so that there exist 5 denominations of stamps so that every postage from 1 to n can be paid for with at most 15 stamps.
trivia: 4422 is an unremarkable number.
historical_date: February 8th is the day in 1989 that an Independent Air Boeing 707 crashes into Pico Alto mountain in the island of Santa Maria in the Azores, killing 144.