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 A019908 #28 Aug 29 2025 12:37:43 %S A019908 1,7,6,3,2,6,9,8,0,7,0,8,4,6,4,9,7,3,4,7,1,0,9,0,3,8,6,8,6,8,6,1,8,9, %T A019908 8,6,1,2,1,6,3,3,0,6,2,3,4,8,0,9,8,6,6,0,2,0,5,3,6,3,9,8,3,8,3,5,4,4, %U A019908 6,9,0,8,9,1,7,7,5,8,6,2,5,4,9,8,6,5,1,3,3,5,0,8,0,3,2,4,4,5,3 %N A019908 Decimal expansion of tangent of 10 degrees. %C A019908 Also the decimal expansion of cotangent of 80 degrees. - _Mohammad K. Azarian_, Jun 30 2013 %H A019908 Ivan Panchenko, <a href="/A019908/b019908.txt">Table of n, a(n) for n = 0..1000</a> %H A019908 <a href="/index/Al#algebraic_06">Index entries for algebraic numbers, degree 6</a>. %F A019908 A root of 3*x^6 -27*x^4 +33*x^2 -1 =0 (others A019968, A019948). - _R. J. Mathar_, Aug 29 2025 %e A019908 0.176326980708464973471090386868618986121633... %t A019908 RealDigits[Tan[10 Degree],10,120][[1]] (* _Harvey P. Dale_, Oct 14 2012 *) %o A019908 (PARI) tan(Pi/18) \\ _Hugo Pfoertner_, Aug 04 2024 %Y A019908 Cf. A019918. %K A019908 nonn,cons,changed %O A019908 0,2 %A A019908 _N. J. A. Sloane_