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Octexep is equal to $$f_{\varepsilon_0^8}(10)$$ using the fast-growing hierarchy.[1] The term was coined by wiki user Denis Maksudov.

It is equal to $$f_{\omega^{\varepsilon_08}}(10)=f_{\varphi_0(\varphi_1(0)\cdot 8)}(10)$$ using the Veblen function $$\varphi_\alpha(\beta)$$.

## Etymology Edit

The 3 parts of the name, "octi", "ex" and "ep", mean 8, exponentiation and $$\varepsilon_0$$ respectively, which form $$\varepsilon_0^8$$ when concatenated backwards. So the full name indicates the ordinal index of the number.

## Approximations in other notations Edit

Notation Approximation
Dollar Function $$10[[[0]_2[0]_2[0]_2[0]_2[0]_2[0]_2[0]_2[0]_2]]$$
Hyperfactorial array notation $$10![1,1,8,1,2]$$
Extended Cascading-E Notation $$E10( \# \text{^^} \#)\text{^} \#8$$
Hardy hierarchy $$H_{\varepsilon_0^{\varepsilon_0^7}}(10)$$
Slow-growing hierarchy $$g_{\vartheta(\varepsilon_{\Omega2}^7\varepsilon_{\Omega+1})}(10)$$

## Sources Edit

1. My system of number names (FGS) - Traveling To The Infinity
Numbers by Denis Maksudov
Alpha series
Epsilon series
Epsilon(0)-multiplication series: Bultep · Trultep · Quadrultep · Quintultep · Sextultep · Septultep · Octultep · Nonultep · Dekultep · Hektultep · Kilultep · Megultep · Gigultep · Terultep · Petultep · Exultep · Zettultep · Yottultep
Epsilon(0)-exponentiation series: Bexep · Trexep · Quadrexep · Quintexep · Sextexep · Septexep · Octexep · Nonexep · Dekexep · Hektexep · Kilexep · Megexep · Gigexep · Terexep · Petexep · Exexep · Zettexep · Yottexep
Epsilon(0)-tetration series: Bitetrep · Tritetrep · Quadritetrep · Quintitetrep · Sextitetrep · Septitetrep · Octitetrep · Nonitetrep · Dekotetrep · Hektotetrep · Kilotetrep · Megotetrep · Gigotetrep · Terotetrep · Petotetrep · Exotetrep · Zettotetrep · Yottotetrep
$$I_\alpha$$ series
$$I(\alpha,\beta)$$ series
Initial $$I(\alpha,\beta)$$ series: Unimah · Bimah · Trimah · Quadrimah · Quintimah · Sextimah · Septimah · Octimah · Nonimah · Dekimah · Hektimah · Kilimah · Megimah · Gigimah · Terimah · Petimah · Eximah · Zettimah · Yottimah
Inserted $$I(\alpha,\beta)$$ series: Uninimah · Binimah · Trinimah · Quadrinimah · Quintinimah · Sextinimah · Septinimah · Octinimah · Noninimah · Dekinimah · Hektinimah · Kilinimah · Meginimah · Giginimah · Terinimah · Petinimah · Exinimah · Zettinimah · Yottinimah