This is a little Javascript program that calculates the frequencies of partials in a harmonic or subharmonic series, and returns the results in a tab-delimited list ready for pasting into Excel.

Frequencies are calculated as: ${\displaystyle f_n=f_0(s(n-<!--\; -\; -->1)+1{)}^e+\mathrm{\alpha <!--\; \alpha \; -->}}$, where f₀ is the fundamental frequency, s is the Scaling Factor, n is the partial number, e is the Exponent and α is the Frequency Addition constant.

If the ‘Subharmonics’ checkbox is ticked, however, then frequencies are calculated as: ${\displaystyle f_n=\frac{f_0}{(s{(n-1)+1)}^e}-\alpha }$

NB: quarter-flats and quarter-sharps are encoded as double-flats and double-sharps, as Sibelius does not correctly import quartertones. Grrrr.