A019955 - OEIS

A019955

Decimal expansion of tangent of 57 degrees.

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

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OFFSET

1,2

COMMENTS

Also the decimal expansion of cotangent of 33 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(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...