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A303817 Decimal expansion of 360/17. 1
2, 1, 1, 7, 6, 4, 7, 0, 5, 8, 8, 2, 3, 5, 2, 9, 4, 1, 1, 7, 6, 4, 7, 0, 5, 8, 8, 2, 3, 5, 2, 9, 4, 1, 1, 7, 6, 4, 7, 0, 5, 8, 8, 2, 3, 5, 2, 9, 4, 1, 1, 7, 6, 4, 7, 0, 5, 8, 8, 2, 3, 5, 2, 9, 4, 1, 1, 7, 6, 4, 7, 0, 5, 8, 8, 2, 3, 5, 2, 9, 4, 1, 1, 7, 6, 4, 7, 0, 5, 8, 8, 2, 3, 5, 2, 9, 4, 1, 1, 7, 6, 4, 7, 0, 5 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

2,1

COMMENTS

Decimal expansion of the external angle of the regular heptadecagon (in degrees).

The repeating pattern [1, 7, 6, 4, 7, 0, 5, 8, 8, 2, 3, 5, 2, 9, 4, 1] is the same as A007450. - Michael B. Porter, Jun 11 2018

Period 16. - Eric Chen, Jun 14 2018

Essentially the same as A021089. - R. J. Mathar, Aug 16 2018

LINKS

Table of n, a(n) for n=2..106.

Wikipedia, Heptadecagon

FORMULA

Equals 21 + (3/17) = 180 - A303816.

From Chai Wah Wu, Dec 20 2019: (Start)

a(n) = a(n-1) - a(n-8) + a(n-9) for n > 11.

G.f.: x^2*(-2*x^9 - 7*x^8 + 7*x^7 - 3*x^6 + 2*x^5 + x^4 - 6*x^3 + x - 2)/((x - 1)*(x^8 + 1)). (End)

EXAMPLE

21.176470588235294117647058823529411764705882352941176470588235294...

MATHEMATICA

RealDigits[360/17, 10, 111][[1]] (* Robert G. Wilson v, Jun 13 2018 *)

CROSSREFS

Cf. A007450, A019434, A210644, A210649, A303816.

Sequence in context: A156882 A266309 A122021 * A158200 A220602 A166345

Adjacent sequences:  A303814 A303815 A303816 * A303818 A303819 A303820

KEYWORD

nonn,cons,easy

AUTHOR

Omar E. Pol, Apr 30 2018

STATUS

approved

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Last modified May 8 12:48 EDT 2021. Contains 343666 sequences. (Running on oeis4.)