I see many sites where they use something like this:
http://www.example.com/someinfo/somenumber
and then they use the 'somenumber' at the end to display content. I dont think they make a page for every number (since there are more than 1000 numbers, How do they do this?
Edit: They even do it on this site: if you look at the url the last bit (using-url-directories-in-php).