Graham's number is an unimaginably large number that is a proven upper bound to the solution of a certain problem in Ramsey theory. It is named after mathematician Ronald Graham who used the number as a simplified explanation of the upper bounds of the problem he was working on in conversations with popular science writer Martin Gardner. Gardner later described the number in Scientific American in 1977, introducing it to the general public. The number was published in the 1980 Guinness Book of World Records which added to the popular interest in the number.
Graham's number, although smaller than...