KöMaL 2011 B4384
According to problem B. 4283. of this journal, if a 23×23 square is dissected into 1×1, 2×2 and 3×3 squares then at least one of the pieces must be a 1×1 square. Given that there is exactly one 1×1 piece, find its possible positions in the big square. (Suggested by Z. Gyenes, Budapest)
Official text KöMaL. Quoted with source.
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