Packing unit squares in a square $s(21)$
The side of the smallest square into which $21$ unit squares can be packed.
Lower bound:
$4.7438$
Upper bound:
$5$
Updates
-
Upper bound: $5$
Reference unknown
[via Packing Unit Squares in Squares: A Survey and New Results, Erich Friedman, 2009-08-14] -
Lower bound: $4.7438$
Reference unknown
[via Packing Unit Squares in Squares: A Survey and New Results, Erich Friedman, 2009-08-14]