Numberphile - Sporting this T-Shirt today. FUN FACT: Ron Graham himself occasionally wears one!!! http://store.dftba.com/products/grahams-number- shirt | Facebook
Numberphile T-Shirts for Sale | Redbubble
Numberphile - Just got my Graham's Number T-Shirt in the post... very cool... http://store.dftba.com/products/grahams-number-shirt Xmas came early! | Facebook
Parker Square Shirt' Men's T-Shirt | Spreadshirt
Amazon.com: Math Numberphile Tshirt T-Shirt : Clothing, Shoes & Jewelry