137138
Ooh, double letters, Fi 8D
Randomness time!
If you take a six-digit number with a repeating pattern every three digits (137137, 457457, etc.), divide that number by 7, then by 11, and finally by 13, you get a three digit version of that number (e.g. 137137/7/11/13 = 137).
Oh, and read blog entry about my day plz. I added a tl;dr version to it.