Graham's number, G, G, G, is much larger than N: N: N: f 64 (4), {f^{64}(4)}, f 6 4 (4), where f (n) = 3 ↑ n 3. { f(n)\;=\;3\↑ ^{n}3}. f (n) = 3 ↑ n 3. This weaker upper bound for the problem, attributed to an unpublished work of Graham, was eventually published and named by Martin Gardner in Scientific American in November 1977.