Chose K and click, again and again. What are you getting?
K =  
x(1) = 1,  x(n+1) = ( 2*x(n) + K / x(n)^2 ) / 3
n =   x(n) =

[ L = (2·L+K/L^2)/3  →  3·L = 2·L+K/L^2  →  L = K/L^2  →  L = ... ]

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