Donald Knuth – What Makes for a Good Computer Science T-Shirt (at 42:12) (opens in new tab)

Several of my T-shirts feature this design:

https://www.ioccc.org/2012/tromp/tromp.c

On the back I put the 232-bit BLC version [1].

For math designs, it's hard to beat

https://i.redd.it/as5zgrv494l81.png

[1] https://www.ioccc.org/2012/tromp/hint.html

he's too humble to mention the Knuth is my Homeboy tshirts: https://geekz.co.uk/shop/ that once existed :)