Mafia: general discussions.

because I'm number 13

What? How could you even think of that? It's a cursed, unlucky number!

I'm claiming number 17 for myself

Zubbi mentioned that the Mafia game will have 15 players. But I might be wrong.

In general, I'm against "claiming" numbers before the topic is created. This encourages others to do the same. In other words, if you don't claim a number now, you might not have the opportunity tomorrow.
Just in case - #4