Numberphile on Twitter: "For a limited time the sparkly “foil” version of our golden spiral T-Shirt is in stock again… US: https://t.co/leO3MLch5k EU: https://t.co/D0dHpNL5QA https://t.co/z2cjChUYTT" / Twitter
parker square numberphile white and black and shir' Women's T-Shirt | Spreadshirt
Numberphile on Twitter: "Sporting my Graham's Number T-Shirt today. Ron Graham himself occasionally wears one! https://t.co/0dnqxS8v5r https://t.co/ERl97n8SHa" / Twitter