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
flagAustralia
0%
0%
91%
8%
12
flagGreece
5%
15%
57%
21%
19
flagAustria
20%
20%
50%
10%
20
flagthe Netherlands
8%
16%
50%
25%
12
flagIndia
19%
26%
48%
5%
52
flagGermany
24%
28%
40%
5%
137
flagthe United Kingdom
18%
28%
40%
12%
32
flagthe United States
19%
39%
33%
7%
51
flagPoland
13%
37%
32%
16%
5335
flagSwitzerland
29%
35%
23%
11%
17