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Hapraneatillion is equal to $$10^{3\times 10^{3\times 10^{3\times 10^{3\times 10^{99}}}}+3}$$.[1] The term was coined by Nirvana Supermind. This number is comparable to googolquadriplex.

## Approximations

Notation Approximation
Arrow notation $$10\uparrow(3\times 10\uparrow(3\times10\uparrow(3\times10\uparrow(3\times 10\uparrow 99) ) )+3)$$ (exact)