login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A221363 Decimal expansion of the Pythagorean comma. 4
1, 0, 1, 3, 6, 4, 3, 2, 6, 4, 7, 7, 0, 5, 0, 7, 8, 1, 2, 5 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

1,4

COMMENTS

In musical tuning, the Pythagorean comma is 12 fifths / 7 octaves = (3/2)^12 / 2^7.

REFERENCES

Larry Baggett, In the Dark on the Sunny Side: A Memoir of an Out-of-Sight Mathematician, Mathematical Association of America, 2012, p. 78.

Dave Benson, Music: A Mathematical Offering. Cambridge: Cambridge University Press (2006): 164.

J. H. Conway and R. K. Guy, The Book of Numbers, New York: Springer-Verlag, 1995, p. 257.

LINKS

Table of n, a(n) for n=1..20.

Peter A. Frazer, Temperament, Midicode, January 2010.

Eric Weisstein's World of Music, Comma of Pythagoras

Wikipedia, Pythagorean comma

OEIS index entry for music

The multi-faceted reach of the OEIS: Music

FORMULA

A229948/A229943 - Omar E. Pol, Oct 25 2013

EXAMPLE

3^12 / 2^19 = 531441/524288 = 1.0136432647705078125

MATHEMATICA

RealDigits[N[31441/524288, 50]][[1]]

CROSSREFS

Cf. A005663, A005664, A010774, A046102.

Sequence in context: A011307 A243625 A321872 * A245943 A245557 A197071

Adjacent sequences:  A221360 A221361 A221362 * A221364 A221365 A221366

KEYWORD

nonn,cons,easy,fini,full

AUTHOR

Jonathan Sondow, Jan 19 2013

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 1 01:06 EDT 2020. Contains 333152 sequences. (Running on oeis4.)