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 A085665 #7 Aug 06 2019 20:06:28 %S A085665 7,4,6,8,5,9,3,3,3,9,8,7,6,5,0,2,2,6,6,8,3,0,8,0,0,0,4,3,4,2,1,0,4,6, %T A085665 4,4,7,5,0,4,9,6,0,1,5,4,4,5,4,6,8,1,5,4,4,3,4,0,6,8,7,1,1,3,2,9,9,2, %U A085665 6,8,0,7,4,4,1,7,9,8,9,3,9,0,1,4,7,1,1,9,5,6,5,2,8,2,2,9,8,2,5 %N A085665 Decimal expansion of tan(tan(1)). %H A085665 J. Blanck, <a href="http://cs-svr1.swan.ac.uk/~csjens/pdf/20640389.pdf">Exact real arithmetic systems: results of competition</a>, pp. 389-393 of J. Blanck et al., eds., Computability and Complexity in Analysis (CCA 2000), Lect. Notes Computer Science, Springer-Verlag, 2001. %t A085665 RealDigits[Tan[Tan[1]],10,120][[1]] (* _Harvey P. Dale_, Aug 06 2019 *) %o A085665 (PARI) tan(tan(1)) \\ _Charles R Greathouse IV_, Mar 25 2014 %K A085665 cons,nonn %O A085665 2,1 %A A085665 _N. J. A. Sloane_, Jul 15 2003