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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
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
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
KEYWORD
nonn,cons,easy
AUTHOR
Omar E. Pol, Apr 30 2018
STATUS
approved