User blog comment:Hyp cos/Googolisms hard to extend?/@comment-32213734-20190420023527/@comment-11227630-20190420032950

Graham's number is not the solution of "the problem", but an upper bound of the solutiion. It is defined as G(64), where G(0) = 4 and \(G(n+1)=3\uparrow^{G(n)}3\).