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A212225 Decimal expansion of (2/Pi)log(phi), the exponential rate factor of golden spiral. 1
3, 0, 6, 3, 4, 8, 9, 6, 2, 5, 3, 0, 0, 3, 3, 1, 2, 2, 1, 1, 5, 6, 7, 5, 7, 0, 1, 1, 9, 9, 7, 7, 0, 6, 8, 9, 2, 3, 5, 2, 5, 7, 8, 5, 6, 3, 8, 7, 5, 6, 9, 8, 3, 8, 3, 2, 9, 3, 4, 9, 1, 2, 1, 5, 9, 7, 8, 9, 1, 6, 1, 2, 6, 7, 4, 7, 5, 3, 4, 5, 6, 6, 7, 4, 1, 3, 9, 1, 8, 8, 1, 5, 0, 4, 8, 1, 7, 9, 2, 6, 3, 8, 2, 7, 6 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

In polar coordinates (r,theta), a golden spiral equation is r~E^(c*theta), where c is this constant, with phi being the golden ratio (A001622).

LINKS

Table of n, a(n) for n=0..104.

Wikipedia, Golden spiral

EXAMPLE

0.3063489625300331221156757...

MATHEMATICA

RealDigits[2 Log[ GoldenRatio]/Pi, 10, 111][[1]] (* Robert G. Wilson v, Oct 24 2014 *)

CROSSREFS

Cf. A001622, A212224.

Sequence in context: A120008 A162197 A160770 * A278085 A051021 A215664

Adjacent sequences:  A212222 A212223 A212224 * A212226 A212227 A212228

KEYWORD

nonn,cons,easy

AUTHOR

Stanislav Sykora, May 06 2012

STATUS

approved

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Last modified December 5 03:30 EST 2016. Contains 278755 sequences.