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 A329215 Decimal expansion of the fundamental frequency of the note G#4/Ab4 in hertz. 10
 4, 1, 5, 3, 0, 4, 6, 9, 7, 5, 7, 9, 9, 4, 5, 1, 3, 8, 5, 2, 2, 4, 4, 1, 7, 8, 8, 9, 3, 3, 7, 1, 5, 1, 2, 5, 4, 4, 3, 3, 3, 0, 0, 5, 3, 4, 6, 9, 0, 4, 6, 8, 3, 8, 0, 4, 6, 5, 3, 5, 0, 6, 2, 6, 2, 0, 0, 4, 6, 0, 5, 4, 6, 0, 5, 0, 3, 0, 9, 4, 9, 3, 3, 9, 8, 8, 7, 3, 2, 0, 0 (list; constant; graph; refs; listen; history; text; internal format)
 OFFSET 3,1 COMMENTS In 12-tone equal temperament, when A4 (the fifth A on the Piano keyboard) is tuned to 440 Hz, the frequency of the note G#4/Ab4 (1 semitone below A4) is 440*2^(-1/12) Hz = 415.3 Hz. LINKS Wikipedia, Piano key frequencies FORMULA Equals 220 * 2^(11/12). EXAMPLE Frequencies of notes in an octave (Hz):    >--------------------------------------------------   |   |  C4                  261.6255653005...  (A329207)   |           +---------------------------------------    >----------| C#4/Db4  277.1826309768...  (A329208)   |           +---------------------------------------   |  D4                  293.6647679174...  (A329209)   |           +---------------------------------------    >----------| D#4/Eb4  311.1269837220...  (A329210)   |           +---------------------------------------   |  E4                  329.6275569128...  (A329211)   |    >--------------------------------------------------   |   |  F4                  349.2282314330...  (A329212)   |           +---------------------------------------    >----------| F#4/Gb4  369.9944227116...  (A329213)   |           +---------------------------------------   |  G4                  391.9954359817...  (A329214)   |           +---------------------------------------    >----------| G#4/Ab4  415.3046975799...  (this seq)   |           +---------------------------------------   |  A4                  440.0000000000   |           +---------------------------------------    >----------| A#4/Bb4  466.1637615180...  (A329217)   |           +---------------------------------------   |  B4                  493.8833012561...  (A329218)   |    >-------------------------------------------------- [New layout from Jon E. Schoenfield, Nov 08 2019] PROG (PARI) default(realprecision, 100); 440 * 2^(-1/12) CROSSREFS See the Example section above for the fundamental frequency of some other notes. Sequence in context: A067061 A115210 A199150 * A214892 A030352 A212643 Adjacent sequences:  A329212 A329213 A329214 * A329216 A329217 A329218 KEYWORD nonn,easy,cons AUTHOR Jianing Song, Nov 08 2019 STATUS approved

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Last modified September 24 20:43 EDT 2021. Contains 347651 sequences. (Running on oeis4.)