1976, Word Ways: The Journal of Recreational Linguistics, volumes 9-10, A. Ross Eckler, page 178:
With this extension, the number system exceeds a number of previously-named giants, such as Archimedes' largest number, Kasner's googolplex, Skewes' number and Candelaria's googoltriplex.
2006 December 12, “Math matters”, in Infinite Probability[1], WordPress:
Reading the wikipedia entry on the subject has kindled a fascination with these sillily large numbers: a googolduplex is 10googolplex, or 1010^10^100. A googoltriplex adds an extra level of exponentiation. A googolyottaplex is a googolplex with a septillion extra levels of exponentiation. A millillion is 103003. A milli-millillion is 103000003.
2012 November 5, “Don’t they teach recreational mathematics anymore?”, in UO Catalyst[2], WordPress:
A googoltriplex, or googolplexplexplex, is one followed by a googolduplex of zeroes. I can continue to tell you what one followed by a googoltriplex is, but we’re going to need more paper.
2017 August 11, “Is there another set of numbers larger than a googolplex?”, in Quora:
Another fascinating fact is that there are even higher numbers than googolduplex, such as googoltriplex, googolquadruplex, and so on, each with an exponentially increasing number of zeroes.
2018, David H Wegert AssDipx3, Megayear Future History, page 123:
In turn, however, I am less powerful than others in my ‘family’ such as googolduoplex[sic] (10^10^10^100), googoltriplex, (10^10^10^10^100) and beyond.
2020 September 6, “What would we call a 1 followed by googolplexian zeros?”, in Quora:
The number 10101010100 10 10 10 10 100 is most commonly called “googoltriplex”, which is based off googolplexian being called “googolduplex”.
2022, Tony Padilla, Fantastic Numbers and Where to Find Them, page 32:
From a googolduplex you can leap to a googoltriplex, a one followed by a googolduplex zeroes, and then to a googolquadruplex, which has a googoltriplex zeroes, and so on.
