I'm working on a website that has a bunch of orphan pages with pagination. For example, one product category will have an orphan page, and since there are hundreds of products in that category, there will be pagination. Interestingly, pages 2 onward of the paginated content are indexed by Google, whereas the original orphan page isn't. There don't appear to be any external backlinks to the paginated content either. Is it possible that the orphan, non-indexed page is getting the subsequent paginated content indexed? It doesn't make sense to me, but I just wanted to find out if anyone else had experienced this phenomenon.