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Skewes' Massive Number - Numberphile
Key Facts In This Video
Before Graham's number, the largest number to be used in a mathematical proof was Skewes's number. 00:30
Skewes' Number is trillions and trillions and trillions of digits long. A googol is only 100 digits long. 00:47
Here's the problem the mathematicians were solving with this number. 02:10