I very much enjoyed your article. I have an interest in Euler bricks which are related to your quadruples in that a "perfect" one (as yet undiscovered; perhaps impossible) would not only have an integer body diagonal, but all the face diagonals would be integers as well.

Enjoy thinking about it. OEIS Sequence A211133 is also related.

## Nice article!

I very much enjoyed your article. I have an interest in Euler bricks which are related to your quadruples in that a "perfect" one (as yet undiscovered; perhaps impossible) would not only have an integer body diagonal, but all the face diagonals would be integers as well.

Enjoy thinking about it. OEIS Sequence A211133 is also related.

Best wishes, Alan