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"Trekillion" redirects here. It is not to be confused with trakillion.

The tradakillion, formerly trekillion, is equal to $$10^{3 \cdot 10^{3 \cdot 10^{39}}+3}$$, or $$10^{3 \cdot 10^{3 \cdot \text{duodecillion}} + 3}$$.[1] The term was coined by Jonathan Bowers.

Expressions in other notations

Notation Expression
Up-arrow notation $$10 \uparrow (3 \times (10 \uparrow (3 \times (10 \uparrow 39)))+3)$$
Chained arrow notation $$10 \rightarrow (3 \times (10 \rightarrow (3 \times (10 \uparrow 39)))+3)$$
BEAF $$\{10,\{3\times \{10,3 \times \{10,39\}\}+3\}\}$$