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A097715 Decimal expansion of 7*sqrt(3)/2. 0
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 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Corresponds to the minimal height-to-diameter ratio of a cylinder such that seven of them may be placed in mutual contact.

REFERENCES

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).

LINKS

Table of n, a(n) for n=1..105.

EXAMPLE

7*sqrt(3)/2=6.0621778264910705273460621952705532842998183883363...

MATHEMATICA

RealDigits[7Sqrt[3]/2, 10, 105][[1]]

CROSSREFS

Sequence in context: A280692 A161419 A136526 * A316710 A198499 A092605

Adjacent sequences:  A097712 A097713 A097714 * A097716 A097717 A097718

KEYWORD

nonn,cons

AUTHOR

Lekraj Beedassy, Sep 21 2004

EXTENSIONS

Corrected and extended by Rick L. Shepherd and Ray Chandler, Sep 21 2004

STATUS

approved

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Last modified September 15 14:38 EDT 2019. Contains 327078 sequences. (Running on oeis4.)