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Double Centifact is the second mixed factorial of 100 or mixed factorial of centifact, written as 100** or 100*2 in multiple mixed factorials. The term was coined by SpongeTechX. It is smaller than {10,10, {100,101,97}} in BEAF, and it is therefore smaller than a boogolplex.

## Etymology

The name of this number is based on the word double and the number centifact.

## Approximations in other notations

Notation Approximation
Bird's array notation $$\{10,10,\{100,101,97\}\}$$
BEAF $$\{10,10,\{100,101,97\}\}$$
Graham Array Notation $$[10,10,[100,101,97]]$$
Strong Array Notation $$s(10,10,s(100,101,97))$$
Hyper-E notation $$E100\#\#97\#2$$
Chained arrow notation $$100 \rightarrow 101 \rightarrow (100 \rightarrow 101 \rightarrow 97)$$
Hyperfactorial array notation $$104![1]![1]$$
Fast-growing hierarchy (using CNF's fundamental sequences) $$f_{\omega}(f_{98}(100))$$
Hardy hierarchy $$H_{\omega^\omega+\omega^{98}}(100)$$
Slow-growing hierarchy $$g_{\varphi(\varphi(96,0),0)}(100)$$