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 A275477 #32 Jan 17 2018 03:17:41 %S A275477 8,8,0,6,8,9,2,3,5,4,2,0,3,5,6,6,6,7,2,2,6,9,4,3,7,8,2,5,6,8,9,0,0,7, %T A275477 2,2,0,2,8,7,5,1,5,9,9,9,8,7,5,0,1,8,2,3,4,4,9,0,0,6,6,8,2,1,6,9,0,8, %U A275477 8,0,0,7,5,9,2,6,4,1,0,9,0,4,0,6,9,6,4,5,3,5,0,8,5,8,6,6,0,2,9,5,0,2 %N A275477 Decimal expansion of arccos(2/Pi). %C A275477 The Winkel tripel projection is the average of the Aitoff projection and an equirectangular projection. The latter component depends on a standard parallel which in radians is this constant. %H A275477 Mike Bostock, <a href="http://bl.ocks.org/mbostock/3682676">Winkel Tripel</a> %H A275477 Wikipedia, <a href="https://en.wikipedia.org/wiki/Winkel_tripel_projection">Winkel tripel projection</a> %e A275477 0.88068923542035666722694378256890... %t A275477 First@ RealDigits@ N[ArcCos[2/Pi], 120] (* _Michael De Vlieger_, Aug 06 2016 *) %o A275477 (PARI) acos(2/Pi) %Y A275477 Cf. A060294 (2/Pi), A232247 (arctan(2/Pi)). %K A275477 nonn,cons %O A275477 0,1 %A A275477 _Jeremy Tan_, Jul 29 2016