The pentacthulteron is equal to E100#^^^####100 in Extended Cascading-E Notation.[1] The term was coined by Sbiis Saibian.


The name of this number is based on the number pentacthulhum and the word "teron" from "polyteron".

Approximations in other notations

Notation Approximation
BEAF \(\{X,X,4,2\}\ \&\ 100\)
Bird's array notation \(\{100,100[1[1 \neg 3]1 \backslash 1 \backslash 1 \backslash 2]2\}\)
Hyperfactorial array notation \(100![1(1)1,1,1,1,2,2]\)
Fast-growing hierarchy \(f_{\varphi(1,3,0)}(99)\)
Hardy hierarchy \(H_{\varphi(1,3,0)}(100)\)
Slow-growing hierarchy \(g_{\vartheta(\Omega_2+\vartheta_1(\Omega_2+3))}(100)\)


It is likely pronounced as so:


  1. Saibian, Sbiis. 4.3.4 - Forging Extended Cascading-E Numbers Part II. Retrieved May 30, 2014.
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