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A188928
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Decimal expansion of sqrt(12)+sqrt(13).
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1
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7, 0, 6, 9, 6, 5, 2, 8, 9, 0, 6, 0, 1, 7, 4, 3, 8, 8, 0, 1, 7, 4, 1, 1, 3, 9, 5, 0, 4, 8, 2, 2, 4, 0, 6, 8, 0, 1, 3, 6, 9, 0, 7, 0, 8, 1, 4, 6, 6, 0, 0, 7, 4, 6, 8, 8, 2, 2, 0, 6, 7, 0, 1, 5, 1, 3, 1, 0, 3, 2, 9, 8, 2, 1, 1, 0, 6, 1, 0, 5, 1, 9, 3, 6, 6, 9, 1, 1, 4, 5, 5, 5, 3, 2, 9, 8, 7, 8, 6, 9, 0, 2, 4, 7, 6, 6, 4, 6, 4, 8, 5, 4, 8, 7, 6, 9, 4, 6, 4, 3, 5, 9, 7, 0, 5, 6, 8, 4, 5, 4
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OFFSET
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1,1
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COMMENTS
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Decimal expansion of the length/width ratio of a sqrt(48)-extension rectangle. See A188640 for definitions of shape and r-extension rectangle.
A sqrt(48)-extension rectangle matches the continued fraction [7,14,2,1,4,21,3,9,1,4,2,1,1,1,2,...] for the shape L/W=sqrt(12)+sqrt(13). This is analogous to the matching of a golden rectangle to the continued fraction [1,1,1,1,1,1,1,1,...]. Specifically, for the sqrt(48)-extension rectangle, 7 squares are removed first, then 14 squares, then 2 squares, then 1 square,..., so that the original rectangle of shape sqrt(12)+sqrt(13) is partitioned into an infinite collection of squares.
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LINKS
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EXAMPLE
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7.0696528906017438801741139504822406801369...
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MATHEMATICA
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r = 48^(1/2); t = (r + (4 + r^2)^(1/2))/2; FullSimplify[t]
N[t, 130]
RealDigits[N[t, 130]][[1]]
ContinuedFraction[t, 120]
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CROSSREFS
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KEYWORD
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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