The main page of the site says that there are (currently) 207 Questions. When I hover on the links though, there is a number, which I am guessing is assigned sequentially. Many recent questions are in the 1300 range. One is 872, there is a 211 and a 14. If "question sequence numbers" are over 1300 and yet there are only "207 Questions", did 1100 meet an untimely end?
All "posts" are stored in one database table internally; there isn't a separate table for questions and answers.
A "post" is one of the following:
- Tag wiki excerpt
- Tag wiki
- Moderator nomination
- Wiki placeholder
- Privilege wiki
There may be gaps in the numbers if the SQL server does something funky, but in theory, if you account for all of the above, the IDs should be sequential.
It also has the interesting side effect of allowing you to link to a question as if it was an answer—
https://cseducators.meta.stackexchange.com/a/200 does link to this question, but
/a/ is really for answers.
But it would be unlikely that questions alone would have sequential IDs... unless no-one's answering 'em!