# witzar

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## witzar's Activity

1. witzar added a post in a topic LCD Watch

2. witzar added a post in a topic LCD Watch

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3. witzar added a post in a topic Covering perforated hexagon with triminoes

Well done, gavinksong.

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4. witzar added a post in a topic six dice = four numbers

5. witzar added a post in a topic Diameters

6. witzar added a post in a topic Set Theory 101

7. witzar added a topic in New Logic/Math Puzzles

Covering perforated hexagon with triminoes
This puzzle is inspired by posted by bonanova.

Again we work on a hexagonal tiling of a plane, and the question is about
possibility of covering some shape with triminoes.
Trimino is a "triangle" formed by three unit hexagons sharing common vertex.

The shape to cover is defined as follows:
Let's pick a unit hexagon and call it H1.
Now we recursively define Hn+1 as a sum of Hn and all unit hexagons adjacent to Hn.
So basically Hn is a "hexagon" with side of length n (unit hexagons).

Let Dn be Hn with one unit hexagon at it's center removed.
So, can you cover D2015 with triminoes?
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