A Heptomino Subset Problem
This problem was suggested on Ed Pegg's mathpuzzle Yahoo group. There are 25 heptominoes which contain a 2x2 square. They can make 25x7 and 35x5 rectangles. I found solutions by hand to both puzzles, as shown below.
The drawing was made with a custom polyomino drawing program, and rendered using the
Dudeney polyform font available from Alpine Electronics.
This article is copyright ©2005 by Michael Keller. All rights reserved.