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A232817 Decimal expansion of the open-tube surface index constant. 5
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 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

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.

LINKS

Stanislav Sykora, Table of n, a(n) for n = 1..1000

Wikipedia, Cylinder (geometry)

FORMULA

Equals (16*Pi)^(1/3) = 2*(2*Pi)^(1/3).

CROSSREFS

Cf. Other surface indices: A232808 (spheres), A232809, A232810, A232811, A232812 (platonic solids), A232813 (closed cylinders), A232814 (open cylinders), A232815 (closed cones), A232816 (open cones).

Sequence in context: A021275 A281802 A197292 * A247398 A094560 A179615

Adjacent sequences:  A232814 A232815 A232816 * A232818 A232819 A232820

KEYWORD

nonn,cons,easy

AUTHOR

Stanislav Sykora, Dec 05 2013

STATUS

approved

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Last modified May 29 07:29 EDT 2017. Contains 287243 sequences.