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There's a page for each individual badge (eg. The Teacher Badge), which shows the description & the list of people who recently earned it. Given that the URL is based off the badge's Id, why are there some badges that appear not to exist (eg. 16 and 29)? Were they removed? Have they not been discovered yet?

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Cool question... –  Michael Pryor Jun 29 '09 at 1:03
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I think one of them was the hacker badge. –  Brad Gilbert Jun 29 '09 at 2:41

3 Answers 3

I'll give you a hint. So far, 16 and 29 are the only missing numbers in the sequence. 29 is a badge (secret) and 16 is just a gap in the identity field for that table, which as gnovice points out was the number for the original "Specialist" badge.

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Maybe they are the super-secret badges you have to earn before you know what they are?</theory></conspiracy>

SO's robots.txt disables caching on /badges so archive.org doesn't shed any light on what the pages once were. I would guess they are badges that were created, decided to be a bad idea and deleted

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Nice detective work re: robots.txt/archive.org... I generally agree with your latter conclusion, although I'm secretly hoping for the former to be true. :) –  Alconja Jun 29 '09 at 1:31

Number 16 was the original "Specialist" badge. It existed at one point as evidenced by the revision list for the SO badge FAQ (revision #8), but it was not "turned on" since they hadn't decided on the requirements for it yet. Once they made tag-specific specialist badges, it disappeared. Maybe there's still a place-holder for it?

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Good find! So I guess that's it for the 'missing' badges... –  Kyle Cronin Jun 30 '09 at 2:21
    
I'm still wondering if 29 is another old one that fell by the wayside or a secret new one they haven't revealed yet... –  gnostradamus Jun 30 '09 at 2:26
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It's highly likely that it's the "Hacker" badge. Jeff's been promising to issue it since the private beta. blog.stackoverflow.com/2009/04/… –  Kyle Cronin Jun 30 '09 at 4:09
    
Ahhhhh... I must have missed that blog post. –  gnostradamus Jun 30 '09 at 4:35

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