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 A085660 #12 Dec 27 2018 18:04:07 %S A085660 9,1,1,7,3,3,9,1,4,7,8,6,9,6,5,0,9,7,8,9,3,7,1,7,3,1,7,8,0,5,4,3,1,8, %T A085660 4,5,2,5,0,4,1,3,4,2,9,2,1,5,6,9,5,4,0,1,3,3,5,6,4,0,4,6,4,7,3,3,3,1, %U A085660 7,3,1,2,7,5,4,5,1,9,5,2,1,3,2,1,2,0,2,4,6,0,3,5,1,6,7,1,7,0,0 %N A085660 Decimal expansion of -cos(e). %C A085660 Also real part of -e^(i*e). - _Stanislav Sykora_, May 16 2012 %H A085660 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 A085660 RealDigits[-Cos[E],10,120][[1]] (* _Harvey P. Dale_, Dec 27 2018 *) %o A085660 (PARI) -cos(exp(1)) \\ _Charles R Greathouse IV_, Mar 25 2014 %K A085660 cons,nonn %O A085660 0,1 %A A085660 _N. J. A. Sloane_, Jul 15 2003