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A comment on Google URL shortener available to the public.

Re:Google URL shortener available to the public by c00p3r on Thursday September 30, 2010 @09:09PM (#1745564)
What hashing function they use?
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Re:Google URL shortener available to the public by mahmud on Thursday September 30, 2010 @10:16PM (#1745721)
Base62.

http://stackoverflow.com/questions/1119722/base-62-conversio...

A case-insensitive variant is Base36:

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
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