Fatto matematico: 1617 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 9 stamps.
Trivia: 1617 is an uninteresting number.
Data storica: June 4th is the day in 1957 that Dr. Martin Luther King, Jr. delivered his famous Power of Nonviolence speech at the University of California, Berkeley.