This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A019976 #15 Jul 08 2025 07:46:31 %S A019976 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, %T A019976 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, %U A019976 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 %N A019976 Decimal expansion of tangent of 78 degrees. %C A019976 Also the decimal expansion of cotangent of 12 degrees. - _Ivan Panchenko_, Sep 01 2014 %C A019976 An algebraic integer of degree 8. - _Charles R Greathouse IV_, Nov 05 2017 %H A019976 Ivan Panchenko, <a href="/A019976/b019976.txt">Table of n, a(n) for n = 1..1000</a> %H A019976 Wikipedia, <a href="http://en.wikipedia.org/wiki/Exact_trigonometric_constants">Exact trigonometric constants</a> %H A019976 <a href="/index/Al#algebraic_08">Index entries for algebraic numbers, degree 8</a> %o A019976 (PARI) 1/tan(Pi/15) \\ _Charles R Greathouse IV_, Nov 05 2017 %K A019976 nonn,cons %O A019976 1,1 %A A019976 _N. J. A. Sloane_