# Googology Wiki

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Megafugagoogol is equal to googol↑↑googol using up-arrow notation[1]. It is equal to {googol,googol,2} in BEAF. The name comes from megafuga- plus googol. It is only slightly larger than a googoldex.

Unknown95387 calls this number hypergoogol.[2]

## Approximation

Notation Approximation
Arrow notation $$\text{googol}\uparrow\uparrow\text{googol}$$
Fast-growing hierarchy $$f_3(\text{googol})$$
Hardy hierarchy $$H_{\omega^3}(\text{googol})$$
Slow-growing hierarchy $$g_{\varepsilon_0}(\text{googol})$$
Steinhaus-Moser Notation $$(\text{googol}-1)[4]$$ lower bound $$\text{googol}[4]$$ upper bound
Strong array notation s(\text{googol},\text{googol},2)
Bowers Exploding Array Function $$\{ \text{googol}, \text{googol}, 2\}$$
Bird's array notation $$\{ \text{googol}, \text{googol}, 2\}$$
Hyperfactorial array notation $$\text{googol}!1$$ lower bound $$(\text{googol}+1)!1$$ upper bound
Chained arrow notation $$\text{googol}\rightarrow\text{googol}\rightarrow 2$$