Packing problems
421 unit squares in a square
Unit squares; smaller container side is better.
This arrangement
20.976371
Container side · 8 significant figures
0.0246% smaller container side than the value listed in Francisco Couzo’s catalogue on 19 October 2026.
| Arrangement | Container side |
|---|---|
| This arrangement | 20.976371 |
| Francisco Couzo’s catalogue | 20.981526 |
Difference: 0.0051545761 smaller side.
Compared with the exact certificate linked below.