Base62. http://stackoverflow.com/questions/1119722/base-62-conversion-in-python http://stackoverflow.com/questions/1119722/base-62-conversio... A case-insensi

Base62. http://stackoverflow.com/questions/1119722/base-62-conversion-in-python http://stackoverflow.com/questions/1119722/base-62-conversio... A case-insensitive variant is Base36: http://en.wikipedia.org/wiki/Base_36 http://en.wikipedia.org/wiki/Base_36 I remember you being a Lisp programmer; it's built into CL's Format function: (format t "~36r" 9999) ==> 7PR