The recent UI change removed comment numbers from issues. It is no longer possible to refer to comment #n.
(Although #n would have been misinterpreted by the markup engine as a link to an issue. An easy, markup-friendly way to link to a comment would be great)
You can use the permalink to link to a specific comment, we feel that the numbers do not add any real value.
So if comment 36 refers to comments 17, 21, and 27, a full link has to be included to each, which readers will have to click on to see which comments they're referring to? That's insane.