11/24/06
A friend directed me to this site. Some of Charlie's T shirts are sold here. The first 4493 digits of Pi were used to construct the symbol of Pi used on the T shirt that Charlie wears on the show. Many othger cool things. (check out the Pluto Responds T-shirt, a personal favorite!)
http://www.thinkgeek.com/brain/whereisit.cgi?t=numb3rs&x=21&y=4