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The qoofolplex is equal to s(10,s(10,25)) using strong array notation, or 101025.[1] The term was coined by Aarex Tiaokhiao. It is equal to 1 followed by 10 septillion zeros. It is 10,000,000,000,000,000,000,000,001 digits long.

Username5243 calls this number gooqtolplex, and it's equal to 10[1]10[1]25 in Username5243's Array Notation.[2]

Writing down the full decimal expansion would take 1019 books of 400 pages each, with 2,500 digits on each page.

## Names in -illion systems

In the short scale, it is also called:

ten trimillitrestrigintatrecenmillitrestrigintatrecenmillitrestrigintatrecenmillitrestrigintatrecenmillitrestrigintatrecenmillitrestrigintatrecenmillitrestrigintatrecenmilliduotrigintatrecentillion

According to Landon Curt Noll's The English name of a number, qoofolplex is also known as:

ten tremilliamilliamilliamilliamilliamilliamilliamilliatrecentretriginmilliamilliamilliamilliamilliamilliamilliatrecentretriginmilliamilliamilliamilliamilliamilliatrecentretriginmilliamilliamilliamilliamilliatrecentretriginmilliamilliamilliamilliatrecentretriginmilliamilliamilliatrecentretriginmilliamilliatrecentretriginmilliatrecenduotrigintillion

## Approximations in other notations

Notation Lower bound Upper bound
Arrow notation $$10\uparrow10\uparrow25$$
Down-arrow notation $$10\downarrow\downarrow26$$
Steinhaus-Moser Notation 18[3][3] 19[3][3]
Copy notation 9[9[25]] 1[10[13]]
H* function H(3H(7)) H(4H(7))
Taro's multivariable Ackermann function A(3,A(3,81)) A(3,A(3,82))
Pound-Star Notation #*((1))*(6,10,10)*3 #*((1))*(4,1,3)*4
BEAF {10,{10,25}}
Hyper-E notation E25#2
Bashicu matrix system (0)(1)[9] (0)(1)[10]
Hyperfactorial array notation (23!)! (24!)!
Fast-growing hierarchy $$f_2(f_2(78))$$ $$f_2(f_2(79))$$
Hardy hierarchy $$H_{\omega^22}(78)$$ $$H_{\omega^22}(79)$$
Slow-growing hierarchy $$g_{\omega^{\omega^{\omega2+5}}}(10)$$

## Sources

Aarex's strong array notation googolisms
3-entry series
Linear array series
Golsol group: Golsol · Binary-golsol
Goolsol group: Goolsol ·
Gurea group: gurea · goourea · gigurea · guriga · guraga · durea · goodurea · guredurea · gurigedurea · duriga

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