It's possible to find questions by ID by going to
<site>/questions/<id> (which automatically redirects to
<site>/questions/<id><question name>), but I don't know how to search answers by ID. Part of the reason is that answers seem to have an entirely different ID format than questions. For example, the first question asked on Meta Stack Exchange is located at the following URL:
but the first answer to that question is located at:
There have been several times where I've had the post ID of an answer, but was unable to find it because I don't know how to find an answer by ID. How can this be accomplished?