This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A131071 #22 Dec 06 2022 07:49:28 %S A131071 261,275,293,309,330,348,366,391,412,440,464,495,521 %N A131071 12-note scale in Hertz (rounded to integers). %H A131071 Wikipedia, <a href="http://en.wikipedia.org/wiki/Pythagorean_tuning">Pythagorean tuning</a>. %H A131071 <a href="/index/Mu#music">Index entries for sequences related to music</a>. %F A131071 The scale involves 9/8 and 256/243 as fractions and the start is A = 440 Hz. %F A131071 The initial term (rounded frequency of the C) is calculated as 16/27 * 440 Hz = 260.74 Hz, cf. the Wikipedia page on Pythagorean tuning for the ratios of the frequencies. - _M. F. Hasler_, Oct 07 2011 %Y A131071 Cf. A131062 for the corresponding C major scale. [_M. F. Hasler_, Oct 07 2011] %Y A131071 Cf. A214832. %K A131071 nonn %O A131071 1,1 %A A131071 _Hans Isdahl_, Sep 24 2007