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 A343058 #21 Feb 05 2025 09:50:43 %S A343058 4,8,1,5,7,4,6,1,8,8,0,7,5,2,8,6,4,4,3,3,2,1,6,2,3,5,3,0,5,6,9,7,0,5, %T A343058 7,5,2,1,9,0,7,8,8,9,1,7,5,2,2,9,9,9,3,5,5,5,4,2,0,5,3,7,2,9,7,9,2,9, %U A343058 8,1,0,3,3,0,5,4,6,2,1,3,9,0,4,3,0,7,9,1,4,1,0,8,9,4,2,0,3,1,8,3,1,3,9,8,1,7,3,8,3,0 %N A343058 Decimal expansion of tan(Pi/7). %C A343058 Root of the equation -7 + 35*x^2 - 21*x^4 + x^6 = 0. - _Vaclav Kotesovec_, Apr 04 2021 %H A343058 G. C. Greubel, <a href="/A343058/b343058.txt">Table of n, a(n) for n = 0..10000</a> %H A343058 <a href="/index/Al#algebraic_06">Index entries for algebraic numbers, degree 6</a>. %e A343058 0.48157461880752864433216235305697... %t A343058 RealDigits[Tan[Pi/7], 10, 120][[1]] (* _Amiram Eldar_, Apr 27 2021 *) %o A343058 (PARI) tan(Pi/7) %o A343058 (SageMath) numerical_approx(tan(pi/7), digits=123) # _G. C. Greubel_, Sep 30 2022 %Y A343058 Cf. A323601 (sin(Pi/7)), A073052 (cos(Pi/7)). %K A343058 nonn,cons,easy %O A343058 0,1 %A A343058 _Seiichi Manyama_, Apr 04 2021