Seventy-sevens

Seventy-sevens is equal to \(7 \lfloor 10^{70} / 9\rfloor\), or 70 copies of 7:
:7,777,777,777,777,777,777,777,777,777,777,777,777,777,777,777,777,777,777,777,777,777,777,777 or metamathematically with interior superscription as \(7^{68}7\)
:googology
Its prime factorization is 7 × 11 × 41 × 71 × 239 × 271 × 4,649 × 9,091 × 123,551 × 909,091 × 4,147,571 × 102,598,800,232,111,471 × 265,212,793,249,617,641.
== Approximations ==
Notation 	Lower bound 	Upper bound
Scientific notation 	\(7.777\times10^{69}\) 	\(7.778\times10^{69}\)
Arrow notation 	\(69\uparrow38\) 	\(5\uparrow100\)
Steinhaus-Moser Notation 	42[3] 	43[3]
Copy notation 	7[70] 	7[70]
Taro's multivariable Ackermann function	A(3,229) 	A(3,230)
Pound-Star Notation 	#*(7,10,8,3,0,2)*8 	#*(8,10,8,3,0,2)*8
BEAF 	{69,38} 	{5,100}
Hyper-E notation 	7E69 	E[5]100
Bashicu matrix system 	(0)(0)(0)(0)[23344] 	(0)(0)(0)(0)[23345]
Hyperfactorial array notation 	53! 	54!
Fast-growing hierarchy 	\(f_2(224)\) 	\(f_2(225)\)
Hardy hierarchy 	\(H_{\omega^2}(224)\) 	\(H_{\omega^2}(225)\)
Slow-growing hierarchy 	\(g_{\omega^{38}10}(65)\)	\(g_{\omega^{37}2}(76)\)
== Sources ==
== See also ==
Category:Numbers
Category:Class 2
Category:Numbers by André Joyce
Category:Numbers with 30 to 100 digits
Category:Odd numbers
Category:Repdigit numbers