One thing that I have noticed about 7's is that when it is in the middle of a draw, you take the numbers on the outside, swap places and that pair will show up. Ex: Michigan, 1/8/13
Take the 39, switching places makes them 93.
M 393 <---Result fell on 1/13.
This is just one of the things I have noticed about pick 3. You dont have to switch places, but I noticed years ago that majority of the time switching places works better.
Does this little bit of knowledge about 7's work every 7/middle draw....no. But it does work often.