"What's special about this number?" is a math-geek cool site explaining the significance of thousands of numbers between 0 and 9999. It was created by Erich Friedman, a math professor at Stetson University in DeLand, Florida. From the site:
0 is the additive identity.
1 is the multiplicative identity.
2 is the only even prime.
3 is the number of spatial dimensions we live in.
4 is the smallest number of colors sufficient to color all planar maps.
5 is the number of Platonic solids.
6 is the smallest perfect number.
7 is the smallest number of faces of a regular polygon that is not constructible by straightedge and compass.
8 is the largest cube in the Fibonacci sequence.
9 is the maximum number of cubes that are needed to sum to any positive integer.
10 is the base of our number system.
Link (Thanks, Paul Saffo!)
