Menger sponge

Menger sponge is equal to 20^3###^^^###3 (also written as E[20]3###^^^###3) using Extended Cascading-E notation.Sbiis Saibian, http://sites.google.com/site/largenumbers/home/4-3/4-3-9-xec_numbers3 Extended Cascading-E Numbers - Large Numbers] The term was coined by Sbiis Saibian.
It is one of the few numbers coined by Sbiis Saibian not to be based on the number 10.
The nth stage of a has \(20^n\) tiny cubes, so there exists a Menger sponge that has Menger sponge cubes in it. The representation itself looks like stage 1 of the Cantor set, which is the 1D counterpart of the Menger sponge.
== Approximations ==
Notation 	Approximation
Bird's array notation 	\(\{3,3[1[1 \neg 3]1 \backslash 1 \backslash 2]2\}\)
Hyperfactorial array notation 	\(3![1(1)1,1,1,2,2]\)
Fast-growing hierarchy (using this system of fundamental sequences)	\(f_{\varphi(1,2,0)}(3)\)
Hardy hierarchy 	\(H_{\varphi(1,2,0)}(3)\)
Slow-growing hierarchy (using this system of fundamental sequences)	\(g_{\psi_0(\Omega_2^{\Omega_2+2})}(3)\)
== See also ==
== Sources ==
Category:Numbers
Category:Numbers by Sbiis Saibian
Category:Extended Cascading-E numbers
Category:Powers of 20
Category:Bachmann's collapsing level
Category:Pentacthulcross series