Graham&#x27;s number - one googolplex raised to the googolplexed power =~ Graham&#x27;s number, which has been used in a proof. There have been larger numbers used in proofs but none yet as famous as Graham&#x27;s number, about which Martin Gardner wrote a popular mathematics article. <a href="http:&#x2F;&#x2F;iteror.org&#x2F;big&#x2F;Source&#x2F;Graham-Gardner&#x2F;GrahamsNumber.html" rel="nofollow">http:&#x2F;&#x2F;iteror.org&#x2F;big&#x2F;Source&#x2F;Graham-Gardner&#x2F;GrahamsNumber.ht...</a>