16
votes
Accepted
8x8 grid with no unmarked L-pentomino
I think the answer is
cells. One way to achieve it is as follows:
There is a straightforward proof that this is the minimum possible.
Bonus for some other pentominoes:
- 16.3k
6
votes
3
votes
Covering an 8x8 grid with X pentominoes
This problem can also be called
Plugging in 8 for n, we get
- 31
1
vote
Accepted
Rubik's Cube with no two squares of the same color on any horizontal, vertical or diagonal line
Since the bounty has ended and nobody tackled question 2 I will show my way of solving this part (which obviously solves question 1 too).
First we observe that it is impossible to put two stickers of ...
- 1,659
Only top scored, non community-wiki answers of a minimum length are eligible