Pentiamond, Heptiamond, and Enneiamond Oddities
is a figure with binary symmetry formed by an odd number of copies of
Here are the minimal known oddities for pentiamonds, heptiamonds,
Please write if you find a smaller solution or solve an unsolved case.
For hexiamonds, see
For octiamonds, see
Last revised 2023-04-24.
Back to Polyform Oddities
Col. George Sicherman