Experiment how to align real number without having a gap.
It's not a perfect allignment of all real numbers. Endless sequences have no defined position.
However there is no gap in the listing where you could point at like: it should be located between X and Y.
Every subset of PI eg. has a defined position in this list. Position for: 3.1415 is: 153584 and so on... I'm not sure whether the index of PI is undefined or just beyond infinty.