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A019949 Decimal expansion of tangent of 51 degrees. 1
1, 2, 3, 4, 8, 9, 7, 1, 5, 6, 5, 3, 5, 0, 5, 1, 3, 9, 8, 5, 5, 6, 1, 7, 4, 6, 9, 5, 3, 7, 5, 9, 3, 5, 1, 4, 0, 0, 5, 3, 6, 2, 5, 5, 8, 4, 0, 7, 7, 9, 7, 6, 5, 3, 6, 4, 2, 1, 2, 5, 9, 2, 0, 8, 8, 4, 3, 7, 5, 7, 3, 0, 1, 3, 4, 7, 7, 4, 0, 2, 1, 4, 1, 2, 3, 1, 2, 8, 7, 0, 4, 0, 6, 4, 3, 5, 3, 8, 1 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Also the decimal expansion of cotangent of 39 degrees. - Ivan Panchenko, Sep 01 2014

LINKS

Ivan Panchenko, Table of n, a(n) for n = 1..1000

Wikipedia, Exact trigonometric constants

FORMULA

Equals cot(13*Pi/60) = ((2+sqrt(3))*(3-sqrt(5)) -2)*(2 + sqrt(2*(5 + sqrt(5))))/4. - G. C. Greubel, Nov 23 2018

EXAMPLE

1.2348971565350513985561746953759351400536255840779765364212592...

MATHEMATICA

RealDigits[Tan[17*Pi/60], 10, 100][[1]] (* G. C. Greubel, Nov 23 2018 *)

RealDigits[Tan[51 Degree], 10, 120][[1]] (* Harvey P. Dale, Jan 18 2021 *)

PROG

(PARI) default(realprecision, 100); tan(17*Pi/60) \\ G. C. Greubel, Nov 23 2018

(MAGMA) SetDefaultRealField(RealField(100)); R:= RealField(); Tan(17*Pi(R)/60); // G. C. Greubel, Nov 23 2018

(Sage) numerical_approx(tan(17*pi/60), digits=100) # G. C. Greubel, Nov 23 2018

CROSSREFS

Cf. A019860 (sine of 51 degrees).

Sequence in context: A056424 A050324 A211227 * A172002 A274927 A066338

Adjacent sequences:  A019946 A019947 A019948 * A019950 A019951 A019952

KEYWORD

nonn,cons

AUTHOR

N. J. A. Sloane

STATUS

approved

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Last modified June 19 09:09 EDT 2021. Contains 345126 sequences. (Running on oeis4.)