Ron Graham Explains the Size of Graham's Number
Numberphile · Interview · YouTube title: How Big is Graham's Number? (feat Ron Graham)
Why it's here
HN commenters recommend it for hearing Graham himself and for its clear introduction to up-arrow notation and enormous numbers.
What it covers
Numberphile talks with mathematician Ron Graham about the magnitude of Graham's number, building up from arrow notation to show how impossibly large it is. It is part of a series of videos on this number.