Tees
Ulam — Prime Number Spiral Heavyweight Tee
In 1963 Stanislaw Ulam, idle during a lecture, wrote the integers in a spiral and marked the primes.
What you're wearing
Diagonals appeared — unexplained, persistent. 3,721 integers, 519 primes. The pattern holds. Printed on garment-dyed heavyweight cotton. · Garment-dyed, ring-spun heavyweight cotton · Relaxed unisex fit · Printed in the USA
Materials & fit
- Fabric
- Combed-cotton, printed to order.
- Fit
- Regular fit, true to size — check the size guide before ordering.
Size guide
| M | 20" / 51 cm | 29" / 74 cm |
| L | 22" / 56 cm | 30" / 76 cm |
| XL | 24" / 61 cm | 31" / 79 cm |
| 2XL | 26" / 66 cm | 32" / 81 cm |
| 3XL | 28" / 71 cm | 33" / 84 cm |
| 4XL | 30" / 76 cm | 34" / 86 cm |
| S | 18" / 46 cm | 28" / 71 cm |
Shipping & production
Made to order. Pressed and shipped in the US, with delivery time added on top depending on your destination.
US standard shipping runs $4.75–$7.98 depending on weight and destination — the exact rate is shown at checkout before you pay.
Each piece is made to order, so we can’t accept returns for a change of mind or the wrong size — please check the size guide first.
If an item arrives damaged or misprinted, contact us through the contact form within 30 days of delivery with a photo and we’ll arrange a free reprint or refund — no need to send anything back.
Same idea, different object
