How do you satisfy if there is no numbers?

Pythagorean Triples

3,4,5

One?

If you're going to pick one, I vote for zero. But zero is rational, so it doesn't really count. This question is BS, essentially.

Yes - there is an infinite number of such numbers. Just take the counting numbers (1,2,3,4, etc...) and put them to the power of 6 (i.e. multiply it by itself 6 times). The sequence of such numbers...