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A097715
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Decimal expansion of 7*sqrt(3)/2.
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0
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6, 0, 6, 2, 1, 7, 7, 8, 2, 6, 4, 9, 1, 0, 7, 0, 5, 2, 7, 3, 4, 6, 0, 6, 2, 1, 9, 5, 2, 7, 0, 5, 5, 3, 2, 8, 4, 2, 9, 9, 8, 1, 8, 3, 8, 8, 3, 3, 6, 3, 3, 2, 1, 9, 8, 1, 9, 5, 3, 2, 4, 4, 2, 8, 0, 8, 1, 7, 6, 5, 5, 5, 9, 1, 8, 0, 8, 0, 0, 1, 2, 9, 7, 8, 4, 0, 1, 1, 6, 5, 3, 6, 5, 0, 3, 7, 0, 0, 1, 4, 8, 6, 4, 6, 9
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OFFSET
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1,1
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COMMENTS
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Corresponds to the minimal height-to-diameter ratio of a cylinder such that seven of them may be placed in mutual contact.
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REFERENCES
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M. Gardner, The Scientific American book of Mathematical Puzzles & Diversions, pp. 115 Simon & Shuster NY 1959 (or Hexaflexagons And Other Mathematical Diversions, The Univ. of Chicago Press Chicago IL 1988).
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LINKS
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EXAMPLE
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7*sqrt(3)/2=6.0621778264910705273460621952705532842998183883363...
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MATHEMATICA
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RealDigits[7Sqrt[3]/2, 10, 105][[1]]
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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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