what i did to make your username into numbers is to use letters in their alphabetical order like- a = 1 b = 2 and when it overlapped with a another digit, i just ignored it, removed the first digit [+1] to make it like j = 1 k = 2 now your user id is like that and for numbers...it's the same. if you have a big username, it's gonna be a big number.
