[matsemann]

1 indexed?

Edit: HN is apparently written in Arc, a dialect of Lisp.

[redox99]

Almost all DBs have a default starting ID of 1.

[tomhoward]

Indeed, though HN didn't use a database when it was first built.

https://news.ycombinator.com/item?id=3515628

[eru]

And Arc is (or was?) implemented in Racket, another language in the Lisp family and closely related to Scheme.