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Not to be confused with triangol.

Triangoogol is equal to trn100(2), where trn(n) is the n-th triangular number.[1] The term was coined by wiki user Allam948736. It is 163,489,217,887,235,173,465,886,368,894 (or approximately $$1.635\times 10^{29}$$) digits long.

## Approximations

Notation Lower bound Upper bound
Arrow notation $$10\uparrow10\uparrow29$$ $$2\uparrow2\uparrow99$$
Down-arrow notation $$10\downarrow\downarrow30$$ $$2\downarrow\downarrow100$$
Steinhaus-Moser notation 21[3][3] 22[3][3]
BEAF {10, {10, 29}} {2, {2, 99}}
Copy notation 1[1[30]] 2[2[30]]
Fast-growing hierarchy $$f_2(f_2(92))$$ $$f_2(f_2(93))$$
Slow-growing hierarchy $$g_{\omega^{\omega^{29}}}(10)$$ $$g_{\omega^{\omega^{29}2}}(10)$$
Hardy hierarchy $$H_{\omega^2\times2}(92)$$ $$H_{\omega^2\times2}(93)$$
Hyper-E notation E29#2 E[2]99#2
Hyperfactorial array notation (26!)! (27!)!

## Decimal expansion

The partial decimal expansion of this number is:[1]

7415799053182406669660341840747385939311187443131696867900056390686796275085884468956158473550043781...(163,489,217,887,235,173,465,886,368,723 other digits)...41276880773456396977294267827105086350274827345751276878885453031