

A003673


Decimal expansion of finestructure constant alpha.
(Formerly M4325)


7



0, 0, 7, 2, 9, 7, 3, 5, 2, 5, 6
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OFFSET

0,3


COMMENTS

Warning: the estimate is continually changing.


REFERENCES

John Barrow, The Constants of Nature, 367pp, Jonathan Cape, 2002.
H. J. Fischbeck and K. Fischbeck, Formulas. Facts and Constants, SpringerVerlag, NY, 2nd ed., 1987.
K. R. Lang, Astrophysical Data: Planets and Stars, SpringerVerlag, NY, 1991.
Martin J. Rees. Just Six Numbers: the deep forces that shape the universe. Phoenix. 1999
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).


LINKS

Table of n, a(n) for n=0..10.
NIST, finestructure constant
Wikipedia, Finestructure constant


FORMULA

alpha = e^2/(4*Pi*E*h*c), where e is the elementary charge (A081823), E is the electric constant (A081799), h is the reduced Planck constant (A254181), c is the speed of light (A003678).  Ilya Gutkovskiy, Jul 27 2016


EXAMPLE

alpha = 7.29735256 * 10^3.


MATHEMATICA

UnitConvert[Quantity["FineStructureConstant"]] (*requires Mathematica 9+; Andrey Zabolotskiy, Aug 15 2016*)


CROSSREFS

Cf. A005600, A082726.
Sequence in context: A154176 A156547 A180872 * A021141 A246948 A248283
Adjacent sequences: A003670 A003671 A003672 * A003674 A003675 A003676


KEYWORD

cons,nonn


AUTHOR

N. J. A. Sloane, Mira Bernstein


EXTENSIONS

Updated May 20 2003
Updated by Omar E. Pol, Aug 09 2009, R. J. Mathar, Dec 15 2012
Updated by Arkadiusz Wesolowski, Feb 08 2016
Edited definition.  N. J. A. Sloane, Feb 11 2016


STATUS

approved



