Circle Packing
I've been having fun with two circle packing games this week.
The first from MathMunch:
http://www.newgrounds.com/portal/view/506364
shared in http://mathmunch.org/2014/11/16/grothendieck-circle-packing-and-string-art/
The second from my colleague Will Dickinson, a circle packing expert:
http://www.addictinggames.com/puzzle-games/filler.jsp
This sketch lets you experiment with a situation like the first game. What is the smallest circle that can hold circles with radii 1 through n?