# number with decimal including all natural numbers

I remember long time ago I faced with a question talking about real numbers which include all natural numbers in them after the decimal point. I don't remember the term for them and I cannot find them on web. Any help?

For example you if say $359$ then I can find it somewhere:

$6.21654651465414588954654321316498984813\color{red}{539}013518496846416\dots$