If the integers from 1 to 999,999,999 are written as words, sorted alphabetically, and concatenated, what is the 51 billionth letter?
(see http://conway.rutgers.edu/~ccshan/wiki/blog/posts/WordNumbers1/ for a detailed discussion and some nifty Haskell code).
![[staff]](http://25.media.tumblr.com/avatar_013241641371_30.png "Tumblr Staff (staff)"){kind=avatar}
![[bobeda]](http://25.media.tumblr.com/avatar_7a4d14575b31_30.png "Tricia Bobeda is a bit of a geek (bobeda)"){kind=avatar}
![[stevenf]](http://25.media.tumblr.com/avatar_d2468be0e476_30.png "stevenf.com (stevenf)"){kind=avatar}
![[scotth]](http://24.media.tumblr.com/avatar_01854ccd90a6_30.gif "Scott Says (scotth)"){kind=avatar}
![[nodenerd]](http://24.media.tumblr.com/avatar_2e1b60639bf3_30.png "Node Nerd (nodenerd)"){kind=avatar}
![[unraveledideas]](http://25.media.tumblr.com/avatar_bdbfc37a7312_30.png "Unraveled Idea Mill (unraveledideas)"){kind=avatar}
![[ecomarci]](http://25.media.tumblr.com/avatar_d2196e704824_30.png "Too cool for school (ecomarci)"){kind=avatar}
![[lolstartups]](http://25.media.tumblr.com/avatar_0f9f3439579b_30.png "lolstartups (lolstartups)"){kind=avatar}
![[pandasuit]](http://assets.tumblr.com/images/default_avatar_30.gif "cave ab homine unius libri (pandasuit)"){kind=avatar}
