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Megafugaeight is equal to $$8\uparrow\uparrow8$$ or 8 tetrated to 8 or 8 pentated to 2.[1] It is approximately equal to $$E15,151,336\#6$$ in Hyper-E notation.

The name is formed by adding the megafuga- prefix to 8.

Notation Approximation
Scientific notation $$10^{10^{10^{10^{10^{10^{15151335.734932054} } } } } }$$} } } } } }\)
Up-arrow notation $$8 \uparrow\uparrow 8, 8 \uparrow\uparrow\uparrow 2$$ (both exact)
BEAF $$\{8,8,2\}, \{8,2,3\}$$ (both exact)
Bird's array notation $$\{8,8,2\}, \{8,2,3\}$$ (both exact)
Hyper-E notation $$E(8)1\#8$$ (exact)
Chained arrow notation $$8\rightarrow8\rightarrow2, 8\rightarrow2\rightarrow3$$ (both exact)
Hyperfactorial array notation $$(((((2537838!)!)!)!)!)!$$
Fast-growing hierarchy $$f_2(f_2(f_2(f_2(f_2(f_2(f_2(21)))))))$$
Hardy hierarchy $$H_{\omega^27}(21)$$
Slow-growing hierarchy $$g_{\varepsilon_0}(8)$$ (exact)

Sources Edit

1. Saibian, Sbiis. The Fz, The Fuga & The Megafuga. Retrieved 2017-03-10.