A019976 Decimal expansion of tangent of 78 degrees.

4, 7, 0, 4, 6, 3, 0, 1, 0, 9, 4, 7, 8, 4, 5, 4, 2, 3, 3, 5, 8, 6, 2, 3, 4, 5, 3, 7, 4, 0, 2, 9, 0, 0, 2, 7, 5, 6, 9, 9, 2, 6, 0, 7, 4, 7, 8, 0, 2, 4, 8, 6, 1, 7, 2, 2, 1, 6, 3, 0, 1, 6, 6, 1, 6, 4, 3, 0, 1, 4, 3, 9, 4, 5, 9, 3, 2, 7, 6, 5, 3, 8, 7, 3, 7, 8, 0, 2, 4, 0, 3, 7, 4, 9, 5, 8, 3, 8, 1

Offset: 1

Author

N. J. A. Sloane

Keywords

• nonn
• cons

Comments

Also the decimal expansion of cotangent of 12 degrees. - Ivan Panchenko, Sep 01 2014

An algebraic integer of degree 8. - Charles R Greathouse IV, Nov 05 2017

Links

• Ivan Panchenko, Table of n, a(n) for n = 1..1000
• Wikipedia, Exact trigonometric constants
• Index entries for algebraic numbers, degree 8

Programs

PARI

1/tan(Pi/15) \\ Charles R Greathouse IV, Nov 05 2017