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Deutero-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 (Hyper-Nested Array Notation) {100,100[1[1¬3]2]1[1[1¬3]2]2}
Bird's array notation (Hierarchical Hyper-Nested Array Notation) {100,100[1[1/2~2]2]1[1[1/2~2]2]2}
Fast-growing hierarchy (with this system of fundamental sequences) \(f_{\omega^{\varphi(1,0,0)\times 2}}(100)\)
\(=f\)\(_{\Gamma_0}\)\(_{\! ^{2}}(100)\)
Hardy hierarchy \(H_{\omega^{\omega^{\varphi(1,0,0)\times 2}}}(100)\)
\(H_{\Gamma_0^{\Gamma_0^{2}}}(100)\)

Sources

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