The tethrathoth-ad-tethraduliathium (also called tethrathoth-trebletetrate) is equal to E100(#^^#)^(#^^#)^(#^^#)100 using Extended Cascading-E Notation.[1] The term was coined by Sbiis Saibian.

Approximations in other notations

Notation Approximation
BEAF ????
Bird's array notation ????
X-Sequence Hyper-Exponential Notation \(100\{(X\uparrow\uparrow X)\uparrow\uparrow X\}2\)
Fast-growing hierarchy \(f_{\varepsilon_0\uparrow\uparrow3}(100)\)
Hardy hierarchy \(H_{\varepsilon_0\uparrow\uparrow3}(100)\)
Slow-growing hierarchy ????


  1. Saibian, Sbiis. 4.3.7 Extended Cascading-E Numbers Part IOne to Infinity. Retrieved 2017-01-02.
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