# Pentiamond, Heptiamond, and Enneiamond Oddities

An *oddity*
is a figure with binary symmetry formed by an odd number of copies of
a polyform.
Here are the minimal known oddities for pentiamonds, heptiamonds,
and enneiamonds.
Please write if you find a smaller solution or solve an unsolved case.
For hexiamonds, see
Hexiamond Oddities.
For octiamonds, see
Octiamond Oddities.

## Pentiamonds

### One-Sided

#### Holeless Variant

## Heptiamonds

### Holeless Variants

### One-Sided

## Enneiamonds

*Last revised 2023-04-24.*

Back to Polyform Oddities
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Polyform Curiosities

Col. George Sicherman
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