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Great Grand Megadestruxul is equal to (...((200![200(200)200(200)200])![200(200)200(200)200])![200(200)200(200)200]...)![200(200)200(200)200] (with Great Megadestruxul parentheses), using Hyperfactorial array notation. The term was coined by Lawrence Hollom.[1]

## Contents

### Etymology

The name of this number is based on the word "great" and the number "Grand Megadestruxul".

### Approximations

Notation Approximation
Bird's array notation $$\{200,\{200,4,201[1[1\neg202]200[1\neg202]200]2\} \\ ,201[1[1\neg202]200[1\neg202]200]2\}$$
Hierarchical Hyper-Nested Array Notation $$\{200,\{200,4,201[1[1/201\sim2]200[1/201\sim2]200]2\} \\ ,201[1[1/201\sim2]200[1/201\sim2]200]2\}$$
Fast-growing hierarchy $$f_{\theta(\Omega^{200},\theta(\Omega^{200}2,198)+199)+200}(f_{\theta(\Omega^{200},\theta(\Omega^{200}2,198)+199)+199}^3(200))$$
Hardy hierarchy $$H_{\theta(\Omega^{200},\theta(\Omega^{200}2,198)+199)\omega^{200}+\theta(\Omega^{200},\theta(\Omega^{200}2,198)+199)\omega^{199}3}(200)$$
Slow-growing hierarchy $$g_{\theta(\Omega_2^{200}2+\theta_1(\Omega_2^{200},\theta_1(\Omega_2^{200}2,198)+199)+200,} \\ _{\vartheta(\Omega_2^{200}2+\theta_1(\Omega_2^{200},\theta_1(\Omega_2^{200}2,198)+199)+200))}(3)$$

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