10 000 Interesting Numbers & Graham's Number

Most numbers have some special characteristic, there is a list of one interesting fact for the numbers additive identity of 0 to the Kaprekar number 9999. This list can be found at What's Special About This Number?. On a vaguely related topic, the largest finite integer used for a mathematical solution is Graham's Number-- a number that makes a Googolplex seem like a single quark in the greatness of the Universe, no joke.