Question about this Radial function Rl(r)

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Homework Statement
Helllo, I have to show that ∆(R1(r)Y11(ϑ,ϕ)) = 0. I already solved the Y11 part but what is R1(r) or generally written Rl(r) written out? I only know the radial function Rn,l(r). Thanks in advance
Relevant Equations
∆(R1(r)Y11(ϑ,ϕ)) = 0
Y11
I can´t find Rl(r) written out on the internet.
 
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