This URL (obtained by right-clicking "link" below the answer and selecting "copy link location"):

[Designing function f(f(n)) == -n](https://stackoverflow.com/questions/731832/interview-question-ffn-n/849062#849062)

leads to a blank page.  

I assume it is designed to go to whatever page the answer is on, but this is not working.

A workaround is to copy the URL from the page number link:

<https://stackoverflow.com/questions/731832?tab=votes&page=3#849062>

But that relies on the answer staying on the same page, and in CW questions it often does not (except with `?tab-oldest`, but that's probably not the default for many users.)

If this is by design, is there a reliable way to get a permalink to an answer that remains valid if the answer gets pushed down to a different page?