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The megafugahundred or megafugaonehundred is equal to 100↑↑100, or 100 tetrated to 100. It is also equal to 100↑↑↑2, or 100 pentated to 2. It is equal to {100,100,2} in BEAF. It's larger than and can be an upper bound for a giggol but smaller than E3#100 = 1010...103 with 100 10's.[1][2]

The name is formed by adding the megafuga- prefix to 100.

## Approximations

Notation Lower bound Upper bound
Arrow notation $$100 \uparrow\uparrow 100$$, $$100 \uparrow\uparrow\uparrow 2$$
Steinhaus-Moser Notation 99[4] 100[4]
Chained arrow notation $$100 \rightarrow 100 \rightarrow 2$$, $$100 \rightarrow 2\rightarrow 3$$
Decimal equivalent E200#99 E201#99
Hyper-E notation $$\textrm{E}[100]1\#100$$
BEAF & Bird's array notation {100,100,2}, {100,2,3}
Strong array notation s(100,100,2), s(100,2,3)
X-Sequence Hyper-Exponential Notation 100{X}2
Hyperfactorial array notation $$100!1$$ $$101!1$$
Nested Factorial Notation $$100![2]$$ $$101![2]$$
Fast-growing hierarchy $$f_3(99)$$ $$f_3(100)$$
Hardy hierarchy $$H_{\omega^3}(99)$$ $$H_{\omega^3}(100)$$
Slow-growing hierarchy $$g_{\varepsilon_0}(100)$$