The ennastaculated-tethracross is equal to E100#^^###9 using Extended Cascading-E Notation.[1] The term was coined by Sbiis Saibian.

Approximations in other notations

Notation Approximation
BEAF \(X \uparrow\uparrow\uparrow\uparrow 10\ \&\ 100\)
Bird's array notation ???
Fast-growing hierarchy \(f_{\varphi(3,0)[9]}(100)\)
Hardy hierarchy \(H_{\varphi(3,0)[9]}(101)\)
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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