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The pentacthularxitri (also called pentacthulto-pentacthulhum) is equal to E100#^^^#^^^#100 using Extended cascading-E notation.[1] The term was coined by Sbiis Saibian.

Approximations

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

Sources

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