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EPUBs can have page numbers in the form of a <pageList> section in the ncx that maps page numbers to html locations. Not all ereaders support it, but there is no harm in including it.
Then you can use a belt and braces approach and also link the page number in the index to the page location in the html with a normal hyperlink, so those ereaders that don't use the pageList can still use the hyperlinks.
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