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A232736
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Decimal expansion of sin(Pi/14), or the imaginary part of (-1)^(1/7).
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10
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2, 2, 2, 5, 2, 0, 9, 3, 3, 9, 5, 6, 3, 1, 4, 4, 0, 4, 2, 8, 8, 9, 0, 2, 5, 6, 4, 4, 9, 6, 7, 9, 4, 7, 5, 9, 4, 6, 6, 3, 5, 5, 5, 6, 8, 7, 6, 4, 5, 4, 4, 9, 5, 5, 3, 1, 1, 9, 8, 7, 0, 1, 5, 8, 9, 7, 4, 2, 1, 2, 3, 2, 0, 2, 8, 5, 4, 7, 3, 1, 9, 0, 7, 4, 5, 8, 1, 0, 5, 2, 6, 0, 8, 0, 7, 2, 9, 5, 6, 3, 4, 8, 7, 4, 7
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OFFSET
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0,1
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COMMENTS
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The corresponding real part is in A232735.
Root of the equation 1 - 4*x - 4*x^2 + 8*x^3 = 0. - Vaclav Kotesovec, Apr 04 2021
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LINKS
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FORMULA
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EXAMPLE
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0.222520933956314404288902564496794759466355568764544955311987...
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MATHEMATICA
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RealDigits[Cos[3*Pi/7], 10, 120][[1]] (* G. C. Greubel, Sep 04 2022 *)
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PROG
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(Magma) R:= RealField(120); Cos(3*Pi(R)/7); // G. C. Greubel, Sep 04 2022
(SageMath) numerical_approx(cos(3*pi/7), digits=120) # G. C. Greubel, Sep 04 2022
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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