What is the Empirical formula of wavenumber of paschen series?

hey student..
please refer this

where λ is the wavelength of the emitted EM radiation and R is the Rydberg constant, and nf,ni are positive integers associated with a specific series.

These series are named after early researchers who studied them in particular depth. For the Lyman series, nf=1 for the Balmer series, nf=2; for the Paschen series, nf=3; and so on

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