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The deka-ennaxis (formerly deka-ennaksys) is equal to E1#1#1#1#1#1#1#10 in Hyper-E notation.[1] The term was coined by Sbiis Saibian. In up-arrow notation, this number is equal to $$10\uparrow^{8} 10$$ or 10 decated to 10. Using Alistair Cockburn's booga- prefix, this number can be named "boogaten".[2]

## Approximations in other notations

Notation Approximation
Up-arrow notation $$10 \uparrow^8 10$$ (exact value)
Chained arrow notation $$10 \rightarrow 10 \rightarrow 8$$ (exact value)
BEAF $$\{10,10,8\}$$ (exact value)
Hyperfactorial array notation $$12!7$$
Fast-growing hierarchy $$f_9(10)$$
Hardy hierarchy $$H_{(\omega^9) 10}(10)$$
Slow-growing hierarchy $$g_{\varphi(7,0)}(10)$$

## Sources

1. Saibian, Sbiis. Hyper-E Numbers. Retrieved 2015-04-30.
2. Pointless Gigantic List of Numbers - Part 3 (10^10^1,000,000 ~ order type w). Retrieved 2021-07-22.

Saibian's power towers of 10s
Googol — Greagol
Greagol — Gugold
Throogol — Godgahlah-ex-grand godgahlah

Gar-: garone · gartwo · garthree · garfour · garfive · garsix · garseven · gareight · garnine · garten · garhundred · gargoogol · gartrialogue · gargoogolplex · gargiggol
Fz-: fzone · fztwo · fzthree · fzfour · fzfive · fzsix · fzseven · fzeight · fznine · fzten · fztwenty · fzhundred · fzthousand · fzmillion · fzgoogol · fzmilliplexion · fzgoogolplex · fzgargoogolplex · fzgargantugoogolplex · fzgiggol
Fuga-: fugaone · fugatwo · fugathree · fugafour · fugafive · fugasix · fugaseven · fugaeight · fuganine · fugaten · fugaeleven · fugahundred · fugagoogol · fugagoogolplex · fugagargoogolplex · fugagargantugoogolplex · fugagiggol
Megafuga-: megafugaone · megafugatwo · megafugathree · megafugafour · megafugafive · megafugasix · megafugaseven · megafugaeight · megafuganine · megafugaten · megafugaeleven · megafugatwelve · megafugathirteen · megafugafourteen · megafugafifteen · megafugasixteen · megafugaseventeen · megafugaeighteen · megafuganineteen · megafugatwenty · megafugathirty · megafugaforty · megafugafifty · megafugasixty · megafugaseventy · megafugaeighty · megafuganinety · megafugahundred · megafugagoogol · megafugagoogolplex · megafugagargoogolplex · megafugagargantugoogolplex
Booga-: boogaone · boogatwo · boogathree · boogafour · boogafive · boogasix · boogaten boogahundred · boogagoogol · boogagoogolplex
Gag: gagone · gagtwo · gagthree · gagfour · gagfive · gagsix · gagseven · gageight · gagnine · gagten · gaggoogol · gaggoogolplex