*blow your mind*: the rather unassumingly-titled What's Special About This Number? which offers up a handy, hyperlinked guide to...well, to what's special about most numbers from 0 to 9999.

Actually, it's not so much a resource for numerologists as it is for math geeks. No references to Nostradamus, Revelations, or Kabbalah here; instead, you get information like:

1246 is the number of partitions of 38 in which no part occurs only once.Yeah, yeah, I know what you're thinkingâ€”who

1248 is the smallest number with the property that its first 6 multiples contain the digit 4.

1249 is the number of simplicial polyhedra with 11 vertices.

1250 is the number of lattice points that are within 1/2 of a sphere of radius 10 centered at the origin.

*doesn't*know how many simplicial polyhedra have 11 vertices? But with hyperlinks on all the really cryptic terms, this makes a nice gateway into some advanced mathematical and geometrical concepts.

I stumbled across this one while doing research for the upcoming 2008 World Almanac for Kids, which will have some interesting new numbers-related materialâ€”including an introduction to game theory for kids ages 8-12. Now *there's* a challenge...

Link: What's Special About This Number?

*Image: Squircled numbers from Claudecf's Flickr stream (CC)*