Grand-icosi-hyperillion is equal to HH20(20)(20), or H(H(...H(20)...)) with icosi-hyperillion H's, where H(x)=103x+3.[1] The term was coined by SuperJedi224.

Approximations

Notation Approximation
Hyper-E notation \(\textrm E33\#20\#2\)
Fast-growing hierarchy \(f_{3}(f_{3}(21))\)
Hardy hierarchy \(H_{\omega^{3}\times 2}(21)\)
Slow-growing hierarchy \(g_{\varepsilon_{\varepsilon_0} }(21)\)

Sources

"-Illion" numbers by SuperJedi224

Numbers By SuperJedi224

Fibonacci Numbers

Pound-Star Notation

Based on the Faxul

Googovipleccix family

Graham Sequence Numbers

-Illion numbers

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