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Megafugaeighty is equal to $$80\uparrow\uparrow80$$. The name is formed by adding the megafuga- prefix to 50.

In other notations

Notation Lower bound Upper bound
Arrow notation $$80\uparrow\uparrow80$$ or

$$80\uparrow\uparrow\uparrow2$$

Hyper-E notation E1#78 E1#79
Steinhaus-Moser notation 79[4] 80[4]
BEAF {80, 80, 2} or {80, 2, 3}
Slow-growing hierarchy $$g_{\epsilon_{0}}(80)$$