Triangrol

Triangrol is equal to trn10(2), where trn(n) is the n-th triangular number.Allam's Numbers - Fascinating Figurate Numbers It is 133 digits long.
The full decimal expansion is shown below:
== Approximations ==
Notation 	Lower bound 	Upper bound
Scientific notation 	\(2.325\times10^{132}\) 	\(2.326\times10^{132}\)
Arrow notation 	\(393\uparrow51\) 	\(394\uparrow51\)
Steinhaus-Moser Notation 	71[3] 	72[3]
Copy notation 	2[133] 	3[133]
Chained arrow notation 	\(393\rightarrow51\) 	\(394\rightarrow51\)
Taro's multivariable Ackermann function	A(3,437) 	A(3,438)
PlantStar's Debut Notation 	[78] 	[79]
BEAF & Bird's array notation 	{393,51} 	{394,51}
Bashicu matrix system 	(0)(0)(0)(0)(0)[11633] 	(0)(0)(0)(0)(0)[11634]
Hyperfactorial array notation 	87! 	88!
Fast-growing hierarchy 	\(f_2(430)\) 	\(f_2(431)\)
Hardy hierarchy 	\(H_{\omega^2}(430)\) 	\(H_{\omega^2}(431)\)
Slow-growing hierarchy 	\(g_{\omega^{51}}(393)\)	\(g_{\omega^{51}}(394)\)
== Sources ==
Category:Numbers
Category:Class 2
Category:Numbers with 101 to 999 digits