Pentacthul-ogdon

The pentacthul-ogdon is equal to E100#^^^#^#8 = E100#^^^########100 in Extended Cascading-E Notation. The term was coined by Sbiis Saibian.
== Etymology ==
The name of this number is based on the number pentacthulhum and the word "yotton" from "polyyotton".
== Approximations in other notations ==
Notation 	Approximation
BEAF 	\(\{X,X,8,2\}\ \&\ 100\)
Bird's array notation 	\(\{100,8[1 [1 \neg 3] 1 [2 \neg 2] 2]2\}\)
Hyperfactorial array notation	\(100![1(1)1]w/9\)
Fast-growing hierarchy 	\(f_{\varphi(1,7,0)}(99)\)
Hardy hierarchy 	\(H_{\varphi(1,7,0)}(100)\)
Slow-growing hierarchy 	\(g_{\vartheta(\Omega_2+\vartheta_1(\Omega_2+7))}(100)\)
== Sources ==
Category:Numbers
Category:Numbers by Sbiis Saibian
Category:Extended Cascading-E numbers
Category:Bachmann's collapsing level
Category:Pentacthulcross series