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 A343060 #23 Feb 05 2025 09:56:41 %S A343060 1,9,8,9,1,2,3,6,7,3,7,9,6,5,8,0,0,6,9,1,1,5,9,7,6,2,2,6,4,4,6,7,6,2, %T A343060 2,8,5,9,7,8,5,0,5,0,1,3,2,1,5,9,0,9,8,1,9,2,1,1,1,6,9,9,5,8,2,5,4,2, %U A343060 9,6,0,4,4,6,0,2,7,7,0,6,3,0,5,3,3,1,9,9,0,6,0,5,7,6,1,4,7,1,3,7,5,7,7,6,0,7,8,2,6,5,6,5,7,0,5,8 %N A343060 Decimal expansion of tan(Pi/16). %H A343060 Wikipedia, <a href="https://en.wikipedia.org/wiki/Trigonometric_constants_expressed_in_real_radicals">Trigonometric constants expressed in real radicals</a> %H A343060 <a href="/index/Al#algebraic_04">Index entries for algebraic numbers, degree 4</a>. %F A343060 Equals sqrt( (2-sqrt(2+sqrt(2)))/(2+sqrt(2+sqrt(2))) ). %F A343060 Equals sqrt(4+2*sqrt(2))-sqrt(2)-1. %e A343060 0.19891236737965800691159762264... %t A343060 RealDigits[Tan[Pi/16], 10, 100][[1]] (* _Amiram Eldar_, Apr 27 2021 *) %o A343060 (PARI) tan(Pi/16) %o A343060 (PARI) sqrt((2-sqrt(2+sqrt(2)))/(2+sqrt(2+sqrt(2)))) %o A343060 (PARI) sqrt(4+2*sqrt(2))-sqrt(2)-1 %Y A343060 Cf. A232738 (sin(Pi/16)), A232737 (cos(Pi/16)), A343057 (tan(Pi/32)). %K A343060 nonn,cons,easy %O A343060 0,2 %A A343060 _Seiichi Manyama_, Apr 04 2021