math_fact: 5638 is the number of 3×3 sliding puzzle positions that require exactly 17 moves to solve starting with the hole in a corner.
trivia: 5638 is an unremarkable number.
historical_date: June 8th is the day in 1887 that Herman Hollerith applies for US patent #395,791 for the 'Art of Applying Statistics' – his punched card calculator.