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A353049
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Decimal expansion of 8*sqrt(2) / 3.
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0
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3, 7, 7, 1, 2, 3, 6, 1, 6, 6, 3, 2, 8, 2, 5, 3, 4, 6, 3, 4, 7, 1, 1, 6, 9, 9, 3, 1, 2, 2, 5, 8, 6, 1, 5, 4, 2, 8, 5, 2, 4, 5, 8, 3, 3, 4, 3, 3, 8, 5, 2, 8, 1, 9, 5, 1, 3, 7, 8, 1, 2, 6, 3, 4, 6, 4, 1, 9, 5, 3, 2, 7, 5, 8, 9, 8, 9, 5, 2, 1, 0, 3, 6, 0, 1, 0, 3, 3, 4, 2, 4, 8, 7, 3, 7, 1, 0, 8
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OFFSET
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1,1
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COMMENTS
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8*sqrt(2) / (3*a) is the maximum curvature of the Folium of Descartes x^3 + y^3 - 3*a*x*y = 0, occurring at the point M of coordinates (3a/2, 3a/2). The corresponding minimum radius of curvature is (3*sqrt(2))*a/16.
This point M is at the intersection of the first bisector with the loop, distinct from O (see curves).
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LINKS
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John A. Tierney, Problem 417, Crux Mathematicorum, Vol. 5, No. 10 (1979), pp. 308-310.
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FORMULA
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EXAMPLE
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3.771236166328253463471169931225...
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MAPLE
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evalf(8*sqrt(2)/3, 100);
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MATHEMATICA
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RealDigits[8*Sqrt[2]/3, 10, 100][[1]] (* Amiram Eldar, Apr 20 2022 *)
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PROG
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CROSSREFS
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Cf. A295709 (arc length of the loop of the Folium of Descartes).
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KEYWORD
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AUTHOR
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STATUS
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approved
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