Wavetable and Nyquist: which size do I need?
The wavetable is ignorant or agnostic about the playback rate and the sample rate in Hz.  What the wavetable knows about is how many points or samples define the waveform, $N$.  All it knows is the amplitude and phase of every harmonic (which are two numbers for each harmonic), and with a little bit of nuance regarding the DC component and, if the number of wavetable samples is even, the Nyquist component.
There is no phase property of the DC component, just a bipolar amplitude, which is fully described by one real number.
Because of aliasing, the Nyquist component must be a cosine component with no sine component to it at all.
So if $N$ is odd, you can fully define the DC component and both the amplitude and phase of $\frac{N-1}{2}$ harmonics, all below Nyquist.
If $N$ is even, you can fully define the DC component, the amplitude and phase of $\frac{N}{2}-1$ harmonics below Nyquist, and only the bipolar amplitude of the harmonic at Nyquist.
In all cases, $N$ real numbets fully define the wavetable and the DFT maps these $N$ numbers to the harmonic amplitude and phase data which are also fully defined by $N$ real numbers.