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 A329218 #13 Aug 21 2023 11:15:49 %S A329218 4,9,3,8,8,3,3,0,1,2,5,6,1,2,4,1,1,1,8,3,0,7,5,4,5,4,1,8,5,8,8,3,8,9, %T A329218 8,7,1,4,2,2,6,0,8,8,8,6,7,0,1,5,4,1,7,1,5,1,3,7,8,0,2,0,0,1,8,8,4,7, %U A329218 7,7,6,2,4,4,8,9,7,8,9,4,8,7,1,8,6,8,6,2,1,9,9 %N A329218 Decimal expansion of the fundamental frequency of the note B4 in hertz. %C A329218 In 12-tone equal temperament, when A4 (the fifth A on the Piano keyboard) is tuned to 440 Hz, the frequency of the note B4 (2 semitones above A4) is 440*2^(2/12) Hz = 493.9 Hz. %H A329218 Wikipedia, <a href="https://en.wikipedia.org/wiki/Piano_key_frequencies">Piano key frequencies</a> %H A329218 <a href="/index/Mu#music">Index entries for sequences based on music</a> %H A329218 <a href="/index/Al#algebraic_06">Index entries for algebraic numbers, degree 6</a> %F A329218 Equals 440 * 2^(1/6). %e A329218 Frequencies of notes in an octave (Hz): %e A329218 >-------------------------------------------------- %e A329218 | %e A329218 | C4 261.6255653005... (A329207) %e A329218 | +--------------------------------------- %e A329218 >----------| C#4/Db4 277.1826309768... (A329208) %e A329218 | +--------------------------------------- %e A329218 | D4 293.6647679174... (A329209) %e A329218 | +--------------------------------------- %e A329218 >----------| D#4/Eb4 311.1269837220... (A329210) %e A329218 | +--------------------------------------- %e A329218 | E4 329.6275569128... (A329211) %e A329218 | %e A329218 >-------------------------------------------------- %e A329218 | %e A329218 | F4 349.2282314330... (A329212) %e A329218 | +--------------------------------------- %e A329218 >----------| F#4/Gb4 369.9944227116... (A329213) %e A329218 | +--------------------------------------- %e A329218 | G4 391.9954359817... (A329214) %e A329218 | +--------------------------------------- %e A329218 >----------| G#4/Ab4 415.3046975799... (A329215) %e A329218 | +--------------------------------------- %e A329218 | A4 440.0000000000 %e A329218 | +--------------------------------------- %e A329218 >----------| A#4/Bb4 466.1637615180... (A329217) %e A329218 | +--------------------------------------- %e A329218 | B4 493.8833012561... (this seq) %e A329218 | %e A329218 >-------------------------------------------------- %e A329218 [New layout from _Jon E. Schoenfield_, Nov 08 2019] %t A329218 RealDigits[440 Surd[2,6],10,120][[1]] (* _Harvey P. Dale_, Oct 16 2022 *) %o A329218 (PARI) default(realprecision, 100); 440 * 2^(1/6) %Y A329218 See the Example section above for the fundamental frequency of some other notes. %K A329218 nonn,easy,cons %O A329218 3,1 %A A329218 _Jianing Song_, Nov 08 2019