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Pen-exitillion, coined by SuperJedi224, is equal to H(165), where H(n) denotes the nth "-illion" number.

It is equal to 103,145,731, and, as such, it is greater than and comparable to bower's Micrillion.

## Etymology

"Pen" is derived from the prefix "Penta", meaning 5. "Exit" is, in this case, derived from "hexit", or "hexidecimal digit".

## Approximations

Notation Lower bound Upper bound
Scientific notation $$1\times10^{3145731}$$
Arrow notation $$10\uparrow3145731$$
Steinhaus-Moser Notation 6[3][3] 7[3][3]
Copy notation 2[2[7]] 3[3[7]]
Taro's multivariable Ackermann function A(3,A(3,20)) A(3,A(3,21))
Pound-Star Notation #*((62457))*721 #*((62458))*721
BEAF {10,3145731}
Hyper-E notation E3145731
Bashicu matrix system (0)(1)[4] (0)(1)[5]
Hyperfactorial array notation (9!)! (10!)!
Fast-growing hierarchy $$f_2(f_2(19))$$ $$f_2(f_2(20))$$
Hardy hierarchy $$H_{\omega^22}(19)$$ $$H_{\omega^22}(20)$$
Slow-growing hierarchy $$g_{\omega^{\omega^63+\omega^5+\omega^44+\omega^35+\omega^27+\omega3+1}}(10)$$

## Source

Numbers By SuperJedi224

Fibonacci Numbers

Level One

Level Two

#*

#**

H#*

#*{}

#*<<>>

H#*<<>>

Bingol series

Based on the Faxul

Other factorials

Googovipleccix family

Graham Sequence Numbers

-Illion numbers

Level One

Level Three

Level Four

"-Illion" numbers by SuperJedi224

Level One

Level Three

Level Four