What is the largest integer ever used in a mathematical proof?
Googolplex
Googol
Graham's number
Centillion
Graham's number is an enormous number that arises as an upper bound on the answer of a problem in the mathematical field of Ramsey theory. The number was published in the 1980 Guinness Book of World Records, adding to its popular interest.
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Answers by country
Googolplex
Googol
Graham's number
Centillion
answers

22

12

12

14

106

22

79

74

10

485

70

20

14

6332

52

13

10