Googology Wiki
Googology Wiki

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.


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


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 \(g_{\omega^{\omega^63+\omega^5+\omega^44+\omega^35+\omega^27+\omega3+1}}(10)\)



See also

Numbers By SuperJedi224

Fibonacci Numbers

Pound-Star Notation

Based on the Faxul

Googovipleccix family

Graham Sequence Numbers

-Illion numbers

"-Illion" numbers by SuperJedi224