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 A131062 #24 Dec 05 2022 20:45:58 %S A131062 261,293,330,348,391,440,495,521,587,660,695,782,880,990,1043,1173, %T A131062 1320,1391,1564,1760,1980,2086 %N A131062 Rounded frequencies of notes in a Pythagorean scale, starting with 260.7 Hertz for a C. %C A131062 The approximate value of 260.7 Hz for the C corresponds to 16/27 * 440 Hz. The frequencies correspond to the ratios [1/1, 9/8, 81/64, 4/3, 3/2, 27/16, 243/128, 2/1]. %H A131062 Wikipedia, <a href="http://en.wikipedia.org/wiki/Just_intonation#Pythagorean_tuning">Just intonation - Pythagorean tuning</a>. %H A131062 Wikipedia, <a href="http://en.wikipedia.org/wiki/Pythagorean_tuning">Pythagorean tuning</a>. %H A131062 <a href="/index/Mu#music">Index entries for sequences related to music</a>. %Y A131062 Cf. A131071 for the same scale including half-tones. %Y A131062 Cf. A071831/A071832 = A071833/24. - _M. F. Hasler_, Jun 14 2012 %Y A131062 Cf. A101285. %K A131062 nonn %O A131062 1,1 %A A131062 _Hans Isdahl_, Sep 24 2007 %E A131062 Value of a(8) corrected, sequence extended to 3 octaves and comments added by _M. F. Hasler_ (following suggestions by _Franklin T. Adams-Watters_ and _Charles R Greathouse IV_), Oct 05 2011