Is there a way to repeat a function n times, for example let’s say R(x)=sqrt(floor(sqrt(x))+ceil(sqrt(x))), and Rn(x)= R(R(R(R(R(…(x)…) with n R’s.

Is there any way to do this?

Looks like your looking for recursion (here’s the support page), which was recently added to the Desmos calculator. Other questions like this regarding the calculator can be directed to support.desmos.com.

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Thank you, I will check that out.