Packing unit squares in a square $s(69)$
The side of the smallest square into which $69$ unit squares can be packed.
Lower bound:
Unknown
Upper bound:
${\approx}8.8562$
Updates
-
Upper bound: ${\approx}8.8562$
Reference unknown
[via Packing Unit Squares in Squares: A Survey and New Results, Erich Friedman, 2009-08-14]