> Thanks for your help. No I need to turn the string which would usually 
> be a headline ('Man lands on the moon') into a unique number. The 
> purpose is to speed up my database queries when checking whether an 
> entry with the same headline already exists in the db.
> Justus

Viewing your problem from a theoretical point of view, something similar 
exists in compression theory, namely arithmetic compression. Of course 
that is not convenient for your porpuses.

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