What’s the biggest number there is? Well, Graham’s Number used to be in the Guinness Book of Records as the biggest number ever used in a mathematical context*. In this classic numberphile video Ron Graham (it’s his number after all) tries to explain just how big it is. For most people three arrows is just about comprehensible, but as Ron himself says, “you ain’t seen nothing yet”. Almost literally mind-blowing.
(Mainly aimed at GCSE and A-level students interested in what high level Maths can look like.)
*It looks like Tree(3) is genuinely useful, and genuinely bigger but it’s extremely technical, and somehow Graham’s Number was first.
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