I have a groundbreaking post that'll put an end to this competition.
Every post number is interesting
Proof: 1 is an interesting number, being the first post of the thread. Now, if one were the only interesting number, then 2 would be the first uninteresting one, and that makes it interesting. So 2 is interesting as well. If 3 were uninteresting, then it'd be the first uninteresting one, and that would make it interesting. [text shortened] If 7008 were uninteresting, then it'd be the first uninteresting one, and that would make it interesting.
Ha! Take that!