^612 appears to be valid. These index numbers are very delicate but if left undisturbed they remain. Little things can remove or change them, like any mod interaction with the account, repairs, renames, etc. Also, changes in status or even becoming a mod shifts the number. But, if you have been a good user, and have retained your account that u value can persist. Obviously, restarting or creating an account creates a different higher sequencing now.
Again, it is something of a litmus check, when someone claims to have been here for years, a quick check of that embedded number can at least add proof. (unless there is intervention at the user account level) Interesting stuff nonetheless.
Pacman has the lowest index number I have found so far. He is number 31.
We even talked a little about his early interests as he beats out other notables such as...
Bust Artist is 210.
Palomine is 242.
User 11 is 612.
Munch Wolf is 744.
RT Poe is 846.
Kithara is 2022.
MissChievous is 2354.
Random X is 2526.
Druul Empire is 2801. (The only consecutive number I found to...)
Vixen is 2802.
Dr Hyde is 2914.
Nimrod is 2967.
Cutter is 3217. (Kith and I made his avatar)
G I John is 5228.
Ms Pacman is 5933.
Al Inflatcha is 6249. (best BE avatar ever)
Notty is 6968.
Squirrelgirl is 9625.
GonZo is 23625. (new # from "modification")
xXxCuriousxXx is 32260.
Beshine is 36360.