In the context of atomic orbitals, the designation of g-orbitals refers to a specific type of orbital known as "d" orbitals. The labels for orbitals follow a specific pattern: s, p, d, f, g, and so on. Therefore, g-orbitals are actually d-orbitals.
Within a given energy level, the d-orbitals consist of five separate orbitals: dxy, dxz, dyz, dx^2-y^2, and dz^2. Each of these orbitals can accommodate a maximum of two electrons.
The next energy level after the d-orbitals is the f-orbitals, not the g-orbitals. The f-orbitals consist of seven separate orbitals: fy(3x^2-y^2), fz(x^2-y^2), fxz, fyz, fxyz, fz^3, and fx^3-3xy^2. Again, each f-orbital can hold a maximum of two electrons.
Therefore, in terms of the sequence of orbitals in the energy levels, the next odd orbital after the f-orbitals would be the g-orbitals (or d-orbitals), not the next prime.