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A205769
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Given an equilateral triangle T, partition each side (with the same orientation) into segments exhibiting the Golden Ratio. Let t be the resulting internal equilateral triangle t. Sequence gives decimal expansion of ratio of areas T/t.
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0
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3, 4, 2, 7, 0, 5, 0, 9, 8, 3, 1, 2, 4, 8, 4, 2, 2, 7, 2, 3, 0, 6, 8, 8, 0, 2, 5, 1, 5, 4, 8, 4, 5, 7, 1, 7, 6, 5, 8, 0, 4, 6, 3, 7, 6, 9, 7, 0, 8, 6, 4, 4, 2, 9, 3, 2, 0, 3, 1, 7, 2, 9, 3, 4, 0, 5, 7, 8, 9, 0, 6, 9, 4, 2, 2, 8, 3, 5, 3, 6, 7, 4, 5, 6, 0, 8, 1, 0, 8, 0, 6, 2, 8, 4, 0, 8, 6, 7, 0, 6, 2, 2, 7, 1, 3
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OFFSET
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1,1
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COMMENTS
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A quadratic number with denominator 2 and minimal polynomial 4x^2 - 14x + 1. - Charles R Greathouse IV, Apr 21 2016
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REFERENCES
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Alfred S. Posamentier & Ingmar Lehmann, Phi, The Glorious Golden Ratio, Prometheus Books, 2011.
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LINKS
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FORMULA
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= phi^2/(1 + 1/phi^2 - 1/phi).
Also, = (phi^4)/2 = 1+3*phi/2 [Clark Kimberling, Oct 24 2012]
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EXAMPLE
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3.427050983124842272306880251548457176580463769708644293203172934...
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MATHEMATICA
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x = GoldenRatio; RealDigits[x^4/(1 - x + x^2), 10, 111][[1]]
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PROG
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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