I believe they are the page numbers that were asigned to the document when it was generated into a ePub document.
Just like you see sometimes when you come across a DTB that has been scanned in.
The number of screens that you have to flip through before you advance the epub page number depends on your font size.
What I don't know - I assume that ePub can be viewed via other readers or is ADE the owner of the format. If it can be viewed by other ePub readers, do they all produce the same characteristic side view page number?
John
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