You are one the right track.
First, the value you are using for Rhydbergs constant is in J, but you are shooting for kJ.
Second, it is 1/∞. 1/∞ = 0
So you have
-R*(0 - 1/n2)
Plugging that in as n=1, and using the correct units, you get the energy per photon, after multiplying it by Avagrado's number, you get the correct value for here on Earth.
Note carefully that Rhydberg's constant is just the negative of the value for Hydrogen here in earth.
So now, what is it on this other planet? You do not even have to bother with Rhydbergs constant to calculate this. You know Rhydbergs constant is the Ionization energy here on Earth (which is given in the question). How does it change on another planet? (1/n2)?