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 A229943 #25 Jul 17 2019 13:41:24 %S A229943 1,0,5,3,4,9,7,9,4,2,3,8,6,8,3,1,2,7,5,7,2,0,1,6,4,6,0,9,0,5,3,4,9,7, %T A229943 9,4,2,3,8,6,8,3,1,2,7,5,7,2,0,1,6,4,6,0,9,0,5,3,4,9,7,9,4,2,3,8,6,8, %U A229943 3,1,2,7,5,7,2,0,1,6,4,6,0,9,0,5,3,4,9,7,9,4,2,3,8,6,8,3,1,2,7,5,7,2,0,1,6,4,6,0,9 %N A229943 Decimal expansion of 256/243, the Pythagorean semitone. %C A229943 The Pythagorean diatonic semitone is one of the musical intervals. Has a ratio of 256/243, and is often called the Pythagorean limma. It is also sometimes called the Pythagorean minor semitone. %C A229943 After the initial term the sequence has period 27, repeat: 0, 5, 3, 4, 9, 7, 9, 4, 2, 3, 8, 6, 8, 3, 1, 2, 7, 5, 7, 2, 0, 1, 6, 4, 6, 0, 9. %D A229943 J. M. Merino de la Fuente, Las vibraciones de la música, Editorial Club Universitario (2006), 133. %D A229943 Alberto Rojo, La física en la vida cotidiana, Siglo Veintiuno Editores (2011), 137. %H A229943 Wikipedia, <a href="http://en.wikipedia.org/wiki/Semitone">Semitone</a> %H A229943 <a href="https://oeis.org/wiki/Index_to_OEIS:_Section_Mu#music">OEIS index entry for music</a> %H A229943 <a href="https://oeis.org/wiki/The_multi-faceted_reach_of_the_OEIS#Music">The multi-faceted reach of the OEIS: Music</a> %F A229943 A229948/A221363 = (3^7/2^11)/(3^12/2^19) = 2^8/3^5 = 256/243. %e A229943 1.053497942386831275720164609... %t A229943 RealDigits[256/243,10,120][[1]] (* _Harvey P. Dale_, Jul 17 2019 *) %Y A229943 Cf. A010774, A221363, A229948, A230437. %K A229943 nonn,cons %O A229943 1,3 %A A229943 _Omar E. Pol_, Oct 25 2013