Several of my T-shirts feature this design:<p><a href="https://www.ioccc.org/2012/tromp/tromp.c" rel="nofollow">https://www.ioccc.org/2012/tromp/tromp.c</a><p>On the back I put the 232-bit BLC version [1].<p>For math designs, it's hard to beat<p><a href="https://i.redd.it/as5zgrv494l81.png" rel="nofollow">https://i.redd.it/as5zgrv494l81.png</a><p>[1] <a href="https://www.ioccc.org/2012/tromp/hint.html" rel="nofollow">https://www.ioccc.org/2012/tromp/hint.html</a>
he's too humble to mention the Knuth is my Homeboy tshirts: <a href="https://geekz.co.uk/shop/" rel="nofollow">https://geekz.co.uk/shop/</a> that once existed :)