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 A329217 #14 Jun 18 2024 11:08:27 %S A329217 4,6,6,1,6,3,7,6,1,5,1,8,0,8,9,9,1,6,4,0,7,2,0,3,1,2,9,7,7,6,3,9,0,3, %T A329217 4,8,3,4,2,8,4,9,8,9,9,6,9,7,4,4,1,6,7,6,5,6,6,0,5,1,7,0,9,8,4,1,8,5, %U A329217 5,1,2,4,2,6,7,8,3,2,5,1,7,8,4,8,8,5,8,0,8,5,8 %N A329217 Decimal expansion of the fundamental frequency of the note A#4/Bb4 in hertz. %C A329217 In 12-tone equal temperament, when A4 (the fifth A on the Piano keyboard) is tuned to 440 Hz, the frequency of the note A#4/Bb4 (1 semitone above A4) is 440*2^(1/12) Hz = 466.2 Hz. %H A329217 Wikipedia, <a href="https://en.wikipedia.org/wiki/Piano_key_frequencies">Piano key frequencies</a> %H A329217 <a href="/index/Mu#music">Index entries for sequences based on music</a> %H A329217 <a href="/index/Al#algebraic_12">Index entries for algebraic numbers, degree 12</a> %F A329217 Equals 440 * 2^(1/12). %e A329217 Frequencies of notes in an octave (Hz): %e A329217 >-------------------------------------------------- %e A329217 | %e A329217 | C4 261.6255653005... (A329207) %e A329217 | +--------------------------------------- %e A329217 >----------| C#4/Db4 277.1826309768... (A329208) %e A329217 | +--------------------------------------- %e A329217 | D4 293.6647679174... (A329209) %e A329217 | +--------------------------------------- %e A329217 >----------| D#4/Eb4 311.1269837220... (A329210) %e A329217 | +--------------------------------------- %e A329217 | E4 329.6275569128... (A329211) %e A329217 | %e A329217 >-------------------------------------------------- %e A329217 | %e A329217 | F4 349.2282314330... (A329212) %e A329217 | +--------------------------------------- %e A329217 >----------| F#4/Gb4 369.9944227116... (A329213) %e A329217 | +--------------------------------------- %e A329217 | G4 391.9954359817... (A329214) %e A329217 | +--------------------------------------- %e A329217 >----------| G#4/Ab4 415.3046975799... (A329215) %e A329217 | +--------------------------------------- %e A329217 | A4 440.0000000000 %e A329217 | +--------------------------------------- %e A329217 >----------| A#4/Bb4 466.1637615180... (this seq) %e A329217 | +--------------------------------------- %e A329217 | B4 493.8833012561... (A329218) %e A329217 | %e A329217 >-------------------------------------------------- %e A329217 [New layout from _Jon E. Schoenfield_, Nov 08 2019] %t A329217 First[RealDigits[440*2^(1/12), 10, 100]] (* _Paolo Xausa_, Jun 18 2024 *) %o A329217 (PARI) default(realprecision, 100); 440 * 2^(1/12) %Y A329217 See the Example section above for the fundamental frequency of some other notes. %K A329217 nonn,easy,cons %O A329217 3,1 %A A329217 _Jianing Song_, Nov 08 2019