Packing problems
420 unit squares in a square
Unit squares; smaller container side is better.
This arrangement
20.966588
Container side · 8 significant figures
0.0361% smaller container side than the value listed in Francisco Couzo’s catalogue on 19 October 2026.
| Arrangement | Container side |
|---|---|
| This arrangement | 20.966588 |
| Francisco Couzo’s catalogue | 20.974165 |
Difference: 0.0075763714 smaller side.
Compared with the exact certificate linked below.