Tethrinoo-icoson

Tethrinoo-icoson is equal to \(\{100,20[1[2\neg2]2]2\}\) in Bird's array notation, using the modified Hierarchical Hyper-Nested Array Notation.Hayden's Big Numbers - My BAN and SAN numbers Retrieved 2023-06-07. The term was coined by googology user HaydenTheGoogologist2009.
==Approximations==
Notation 	Approximation
Almighty Array Notation 	\(a\text{*}(100,20\{1!!2\}2)\)
Bowers' Exploding Array Function 	\(X \uparrow^{21} X \& 100\) (weak bound, non-climbing)
\(X \uparrow\uparrow X^{20} \& 100\) (strong bound, climbing)
Extended Cascading-E Notation 	\(\text{E}100\#\text{^^}(\#\text{^}\#)20\)
DeepLineMadom's Array Notation 	\(100[1\{1//2\}2]20\)
Hayden's Extended Array Notation 	\(100 [1[2\neg2]2]_2 20\) (exact)
Strong array notation 	\(\text{s}(100,20\{1\{2^{`}\}2\}2)\)
Username5243's Array Notation 	\(100[0\{0\{1\}_1 1\}1]20\)
Fast-growing hierarchy (with this system of fundamental sequences)	\(f_{\varphi(\omega,0)}(20)\)
Hardy hierarchy (with this system of fundamental sequences) 	\(H_{\varphi(\omega,0)}(20)\)
Slow-growing hierarchy (with this system of fundamental sequences)	\(g_{\psi_0(\Omega_2^{\omega})}(20)\)
==Sources==
Category:Numbers
Category:Numbers by HaydenTheGoogologist2009
Category:Binary phi level
Category:Bird's array notation numbers