@infobeautiful This can likely be extrapolated to longer PINs:
+ 1-digit sequence repeated N times
+ M-digit sequence repeated N/M+1 times, truncated
+ N ascending digits, starting with M
+ N descending digits, starting with M
+ dates converted into numeric sequences

The last is also why if you play lottery with non-random picks, you should always pick at least one number greater than 31. If you win the jackpot, you're less likely to share with another winner.