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The kilofaxul (also called faxulenek[1]) is equal to faxul! or (200!)!, where ! denotes the factorial.[2] It is also equal to 200!2, using Nested Factorial Notation. The term was coined by Lawrence Hollom.

## Etymology

The name of this number is based on SI prefix "kilo-" and the number "faxul".

## Approximations in other notations

Notation Lower bound Upper bound
Arrow notation $$124\uparrow416\uparrow144$$ $$338\uparrow621\uparrow135$$
Down-arrow notation $$565\downarrow\downarrow138$$ $$99\downarrow\downarrow190$$
Steinhaus-Moser Notation 168[3][3] 169[3][3]
Copy notation 2[2[378]] 3[3[378]]
H* function H(98H(124)) H(99H(124))
Taro's multivariable Ackermann function A(3,A(3,1252)) A(3,A(3,1253))
Pound-Star Notation #*((1))*((154))*9 #*((1))*((155))*9
BEAF {124,{416,144}} {338,{621,135}}
Hyper-E notation E[565]137#2 E[99]189#2
Bashicu matrix system (0)(1)[35] (0)(1)[36]
Fast-growing hierarchy $$f_2(f_2(1\,245))$$ $$f_2(f_2(1\,246))$$
Hardy hierarchy $$H_{\omega^22}(1\,245)$$ $$H_{\omega^22}(1\,246)$$
Slow-growing hierarchy $$g_{\omega^{\omega^{\omega^23+\omega7+7}2}}(10)$$ $$g_{\omega^{\omega^{\omega^23+\omega7+7}3}}(10)$$

## Conversion

(KiloFaxul)$$!$$ = Megafaxul