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 A243596 #14 Jun 24 2014 00:36:52 %S A243596 2,8,8,8,3,6,5,7,9,7,5,1,3,6,4,0,1,3,7,5,4,3,1,2,1,7,4,0,5,5,0,0,9,2, %T A243596 3,1,9,8,4,1,5,2,5,9,9,2,9,5,9,0,1,0,2,3,8,4,7,2,8,7,2,8,1,0,0,2,8,7, %U A243596 3,7,2,0,6,5,6,4,4,6,7,0,2,6,0,8,0,6,9,8,9,5,5,6,5,8,7,4,0,9,6,7,6,9,4,5,3 %N A243596 Decimal expansion of the solid angle in steradians (sr) subtended by a cone with the polar angle of 1 radian (rad). %C A243596 Given a right circular cone with polar angle theta, the solid angle it subtends is 2*Pi(1-cos(theta)). Not to be confused with the area, in steradians, of a spherical square with the side theta (see A231986). %H A243596 Stanislav Sykora, <a href="/A243596/b243596.txt">Table of n, a(n) for n = 1..2000</a> %H A243596 Wikipedia, <a href="http://en.wikipedia.org/wiki/Solid_angle">Solid angle</a> %H A243596 Wikipedia, <a href="http://en.wikipedia.org/wiki/Steradian">Steradian</a> %H A243596 Wikipedia, <a href="http://en.wikipedia.org/wiki/Cone">Cone</a> %F A243596 2*Pi*(1-cos(1)) = 4*Pi*A243597. %e A243596 2.8883657975136401375431217405500923198415259929590102... %t A243596 RealDigits[2 Pi (1 - Cos[1]), 10, 111][[1]] (* _Robert G. Wilson v_, Jun 12 2014 *) %o A243596 (PARI) 2*Pi*(1-cos(1)) %Y A243596 Cf. A231986, A243597 (fraction of full solid angle). %K A243596 nonn,cons,easy %O A243596 1,1 %A A243596 _Stanislav Sykora_, Jun 07 2014