math_fact: 7880 is the maximum value of n so that there exist 4 denominations of stamps so that every postage from 1 to n can be paid for with at most 26 stamps.
trivia: 7880 is an uninteresting number.
historical_date: July 28th is the day in 1540 that Thomas Cromwell is executed at the order of Henry VIII of England on charges of treason.