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A021141
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Decimal expansion of 1/137.
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0
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0, 0, 7, 2, 9, 9, 2, 7, 0, 0, 7, 2, 9, 9, 2, 7, 0, 0, 7, 2, 9, 9, 2, 7, 0, 0, 7, 2, 9, 9, 2, 7, 0, 0, 7, 2, 9, 9, 2, 7, 0, 0, 7, 2, 9, 9, 2, 7, 0, 0, 7, 2, 9, 9, 2, 7, 0, 0, 7, 2, 9, 9, 2, 7, 0, 0, 7, 2, 9, 9, 2, 7, 0, 0, 7, 2, 9, 9, 2, 7, 0, 0, 7, 2, 9, 9, 2, 7, 0, 0, 7, 2, 9, 9, 2, 7, 0, 0, 7
(list; constant; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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COMMENTS
| Until the middle of the 20th century, the so called "fine structure constant", a most important dimensionless physical constant, was widely supposed to be exactly 1/137.
After Wikipedia :
"Arthur Eddington [British astronomer and physicist] argued that the value could be "obtained by pure deduction" and he related it to the Eddington number, his estimate of the number of protons in the Universe. This led him in 1929 to conjecture that its reciprocal was precisely the integer 137. Other physicists neither adopted this conjecture nor accepted his arguments but by the 1940s experimental values deviated sufficiently from 1/137 to refute Eddington's argument. Attempts to find a mathematical basis for this dimensionless constant have continued up to the present time." [ Jean-François Alcover, Sep 01 2011 ]
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FORMULA
| a(n)=(1/56)*{58*(n mod 8)-26*[(n+1) mod 8]+58*[(n+2) mod 8]+9*[(n+3) mod 8]-40*[(n+4) mod 8]+44*[(n+5) mod 8]-40*[(n+6) mod 8]+9*[(n+7) mod 8]}, with n>=0 [From Paolo P. Lava (paoloplava(AT)gmail.com), Sep 21 2009]
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CROSSREFS
| Sequence in context: A156547 A180872 A003673 * A147677 A090243 A145338
Adjacent sequences: A021138 A021139 A021140 * A021142 A021143 A021144
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KEYWORD
| nonn,cons
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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