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The exahyperfaxul is equal to petahyperfaxul![1] using Hyperfactorial Array Notation. The term was coined by Lawrence Hollom.[1]

### Etymology

The name of this number is based on SI prefix "exa-" and the number "hyperfaxul".

### Approximations in other notations

Notation Approximation
Hyper-E notation $$\textrm E10\#\#201\#7$$
Chained arrow notation $$10 \rightarrow 198 \rightarrow (10 \rightarrow 198 \rightarrow (10 \rightarrow 198 \rightarrow (10 \rightarrow 198 \rightarrow (10 \rightarrow 198 \rightarrow (10 \rightarrow 198 \rightarrow (10 \rightarrow 198 \rightarrow 201))))))$$
BEAF $$\{10,198,\{10,198,\{10,198,\{10,198,\{10,198,\{10,198,\{10,198,201\}\}\}\}\}\}\}$$
X-Sequence Hyper-Exponential Notation $$201\{X+1\}8$$
Fast-growing hierarchy (using CNF's fundamental sequences) $$f_{\omega}(f_{\omega}(f_{\omega}(f_{\omega}(f_{\omega}(f_{\omega}(f_{\omega}(202)))))))$$
Hardy hierarchy $$H_{\omega^{\omega}7}(202)$$
Slow-growing hierarchy $$g_{\varphi(\varphi(\varphi(\varphi(\varphi(\varphi(\varphi(200,0),0),0),0),0),0),0)}(200)$$