Periodicity of Fourier series's coefficients

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Why exactly continuous fourier-series's coefficients aren't periodic like coefficients of discrete transform (DFT)? $\exp(-j*2*\pi)$ is periodic in both sequences.

I understand in general, that continuous fourier-series's coefficients aren't periodic. But I'm asking a little bit deeper question. What exactly makes DFT coefficients periodic and continuous FS not periodic? Where is the reason?