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

It is pronounced like so:

Approximations in other notations

Notation Approximation
Bird's array notation \(\{100,99 [1 [1 [1 \neg 3] 2 \neg 3] 2] 2\}\)
Fast-growing hierarchy \(f_{\varphi(\Gamma_0,0,0)}(99)\)
Hardy hierarchy \(H_{\varphi(\Gamma_0,0,0)}(100)\)


  1. Saibian, Sbiis. 4.3.11 - Forging Extended Cascading-E Numbers Part V. Retrieved July 29, 2014.
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