Dave at MathNotations was up early today posting the 17th Edition of the Carnival of Mathematics. 17 is sometimes called the most “random” number, although one (not very scientific) test has shown 3 to be even more “random.”
Did you know there are only 17 ways you can design wallpaper? The 17 Wallpaper Tilings has animations of each pattern.
Denise Gaskins' Let's Play Math 