The 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 Edit

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

Sources Edit

  1. -Illions - Almost Infinite
Numbers By SuperJedi224

Fibonacci Numbers

Pound-Star Notation

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