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A232817
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Decimal expansion of the open-tube surface index constant.
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5
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3, 6, 9, 0, 5, 4, 0, 2, 9, 7, 2, 8, 8, 0, 5, 6, 8, 3, 8, 1, 9, 3, 6, 0, 7, 7, 5, 9, 1, 7, 7, 9, 7, 6, 0, 5, 3, 5, 6, 0, 0, 7, 2, 5, 3, 2, 4, 3, 1, 9, 0, 3, 3, 2, 5, 4, 5, 1, 0, 1, 7, 9, 4, 6, 6, 6, 9, 5, 3, 5, 8, 8, 7, 6, 7, 5, 1, 9, 9, 3, 0, 1, 3, 1, 0, 6, 1, 8, 9, 5, 7, 2, 7, 7, 3, 8, 7, 5, 6, 9, 3, 6, 1, 1, 1
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OFFSET
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1,1
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COMMENTS
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The external surface index of an open-ended cylinder (tube) equals this constant, multiplied by (Length/Diameter)^(1/3).
For a general definition of surface index, see A232808.
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LINKS
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FORMULA
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Equals (16*Pi)^(1/3) = 2*(2*Pi)^(1/3).
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MATHEMATICA
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RealDigits[2 * Surd[2 * Pi, 3], 10, 120][[1]] (* Amiram Eldar, May 17 2023 *)
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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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