To calculate the partials of a harmonic series, multiply the frequency f of a fundamental note by consecutive integers:
The first partial is 1 × f;
The second partial is 2 × f;
The third partial is 3 × f;
And so on. Doing so, you will obtain a scale of notes related by simple ratios of integers numbers: the first two harmonics are in ratio 1:2, the second and third 3:2, etc.
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