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Lexxijfa is in Joyce's factorial series formed with a verbalized -x- and the -fa suffix, $$72! = g(71, 1, 2, 71, 72)$$.[1] It has 104 digits and its decimal representation is:
61234458376886086861524070385274672740778091784697328983823014963978384987221689274204160000000000000000

## Approximations

Notation Lower bound Upper bound
Scientific notation $$6.123\times10^{103}$$ $$6.124\times10^{103}$$
Arrow notation $$119\uparrow50$$ $$91\uparrow53$$
Chained arrow notation $$119→50$$ $$91→53$$
Steinhaus-Moser Notation 58[3] 59[3]
Copy notation 5[104] 6[104]
Taro's multivariable Ackermann function A(3,341) A(3,342)
Pound-Star Notation #*(12,4,0,5,8,1,3)*9 #*(12,4,8,8,1,7)*11
BEAF {119,50} {91,53}
Bird's array notation {119,50} {91,53}
Strong array notation s(119,50) s(91,53)
Hyper-E notation 6E103 7E103
Hyperfactorial array notation 72!
Fast-growing hierarchy $$f_2(336)$$ $$f_2(337)$$
Hardy hierarchy $$H_{\omega^2}(336)$$ $$H_{\omega^2}(337)$$
Slow-growing hierarchy $$g_{\omega^{55}43}(72)$$ $$g_{\omega^{\omega+24}18}(40)$$

## Sources

1. http://michaelhalm.tripod.com/mathematics_beyond_the_googol.html