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A019955
Decimal expansion of tangent of 57 degrees.
1
1, 5, 3, 9, 8, 6, 4, 9, 6, 3, 8, 1, 4, 5, 8, 2, 9, 0, 4, 8, 2, 6, 7, 9, 6, 9, 7, 2, 6, 0, 2, 7, 8, 0, 1, 2, 5, 7, 0, 8, 3, 8, 7, 0, 3, 2, 1, 6, 5, 4, 8, 1, 6, 7, 9, 7, 9, 9, 1, 8, 5, 5, 0, 3, 0, 0, 2, 3, 3, 3, 5, 6, 6, 9, 4, 9, 0, 8, 4, 1, 2, 5, 4, 0, 8, 1, 5, 7, 6, 6, 3, 6, 7, 8, 2, 9, 6, 5, 5
OFFSET
1,2
COMMENTS
Also the decimal expansion of cotangent of 33 degrees. - Ivan Panchenko, Sep 01 2014
FORMULA
Equals cot(11*Pi/90) = (1/4)*(2 - sqrt(2*(5 - sqrt(5))))*(2 - (2 + sqrt(3))*(3 + sqrt(5))). - G. C. Greubel, Nov 22 2018
EXAMPLE
1.5398649638145829048267969726027801257083870321654816797991855...
MATHEMATICA
RealDigits[Tan[57 Degree], 10, 120][[1]] (* Harvey P. Dale, Jul 20 2016 *)
RealDigits[Tan[19*Pi/60], 10, 100][[1]] (* G. C. Greubel, Nov 22 2018 *)
PROG
(PARI) default(realprecision, 100); tan(19*Pi/60) \\ G. C. Greubel, Nov 22 2018
(Magma) SetDefaultRealField(RealField(100)); R:= RealField(); Tan(19*Pi(R)/60); // G. C. Greubel, Nov 22 2018
(Sage) numerical_approx(tan(19*pi/60), digits=100) # G. C. Greubel, Nov 22 2018
CROSSREFS
Cf. A019866 (sine of 56 degrees).
Sequence in context: A201938 A201410 A332528 * A296345 A317907 A075693
KEYWORD
nonn,cons
STATUS
approved