Conflict3d: Yes, I thought it might be that but when I click on that the screen flashes as if the page would be refreshed but nothing changes.
Adding a /post### to the url of a thread will take you to that specific post (mostly, too many missing posts may mess the pages in a thread, known bug). If you were already at that post, then it most likely will only move the page a bit up or down. To better see the effect, either open the post in a new tab, or click the post's number, scroll up or down, then refresh the url.
P.S. Post numbers are always preferable to page numbers, since not everyone uses 20 posts/page. I prefer to use 50 posts/page, so post 161 would be on page 4, not page 9.