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 A329214 #14 Jun 19 2024 03:05:34 %S A329214 3,9,1,9,9,5,4,3,5,9,8,1,7,4,9,2,9,4,0,8,5,6,9,9,5,3,0,4,5,9,8,2,5,5, %T A329214 0,3,5,1,4,3,7,3,5,5,0,9,8,6,3,9,0,5,7,7,4,8,8,8,5,3,0,7,6,5,9,0,8,4, %U A329214 9,5,5,3,4,5,8,9,3,5,4,9,6,7,6,0,5,1,1,3,3,7,5 %N A329214 Decimal expansion of the fundamental frequency of the note G4 in hertz. %C A329214 In 12-tone equal temperament, when A4 (the fifth A on the Piano keyboard) is tuned to 440 Hz, the frequency of the note G4 (2 semitones below A4) is 440*2^(-2/12) Hz = 392.0 Hz. %H A329214 Wikipedia, <a href="https://en.wikipedia.org/wiki/Piano_key_frequencies">Piano key frequencies</a> %H A329214 <a href="/index/Mu#music">Index entries for sequences based on music</a> %H A329214 <a href="/index/Al#algebraic_06">Index entries for algebraic numbers, degree 6</a> %F A329214 Equals 220 * 2^(5/6). %e A329214 Frequencies of notes in an octave (Hz): %e A329214 >-------------------------------------------------- %e A329214 | %e A329214 | C4 261.6255653005... (A329207) %e A329214 | +--------------------------------------- %e A329214 >----------| C#4/Db4 277.1826309768... (A329208) %e A329214 | +--------------------------------------- %e A329214 | D4 293.6647679174... (A329209) %e A329214 | +--------------------------------------- %e A329214 >----------| D#4/Eb4 311.1269837220... (A329210) %e A329214 | +--------------------------------------- %e A329214 | E4 329.6275569128... (A329211) %e A329214 | %e A329214 >-------------------------------------------------- %e A329214 | %e A329214 | F4 349.2282314330... (A329212) %e A329214 | +--------------------------------------- %e A329214 >----------| F#4/Gb4 369.9944227116... (A329213) %e A329214 | +--------------------------------------- %e A329214 | G4 391.9954359817... (this seq) %e A329214 | +--------------------------------------- %e A329214 >----------| G#4/Ab4 415.3046975799... (A329215) %e A329214 | +--------------------------------------- %e A329214 | A4 440.0000000000 %e A329214 | +--------------------------------------- %e A329214 >----------| A#4/Bb4 466.1637615180... (A329217) %e A329214 | +--------------------------------------- %e A329214 | B4 493.8833012561... (A329218) %e A329214 | %e A329214 >-------------------------------------------------- %e A329214 [New layout from _Jon E. Schoenfield_, Nov 08 2019] %t A329214 First[RealDigits[220*2^(5/6), 10, 100]] (* _Paolo Xausa_, Jun 18 2024 *) %o A329214 (PARI) default(realprecision, 100); 440 * 2^(-2/12) %Y A329214 See the Example section above for the fundamental frequency of some other notes. %K A329214 nonn,easy,cons %O A329214 3,1 %A A329214 _Jianing Song_, Nov 08 2019