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Problem of the Month (May 2012)

How can a integer-sided square be packed with smaller distinct integer-sided squares with the smallest waste? For small n, the best packing of square with side n is by squares of sides n-1 and 1, with waste 2n. But for larger n, we can do better. What are the best packings for larger n?
15

waste=21
17

waste=29
18

waste=20
19

waste=25
20

waste=30


What if squares are replaced with almost squares, rectangles of the form n×(n+1)?

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