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 A265305 #8 Dec 18 2015 11:36:37 %S A265305 1,0,3,4,3,4,8,4,4,0,4,4,1,3,4,3,7,7,2,4,3,9,9,2,8,7,0,4,6,7,7,3,3,8, %T A265305 4,7,2,2,1,1,0,4,2,7,1,4,6,9,9,9,4,2,1,0,7,0,9,4,3,8,3,3,2,7,4,7,4,3, %U A265305 7,9,7,1,7,6,4,6,6,0,6,1,7,0,5,9,3,1 %N A265305 Decimal expansion of Sum_{k>=1} (c(2k)-c(2k-1)), where c = convergents to sqrt(8). %e A265305 sum = 1.0343484404413437724399287046773384722110427146999... %t A265305 x = Sqrt[8]; z = 600; c = Convergents[x, z]; %t A265305 s1 = Sum[x - c[[2 k - 1]], {k, 1, z/2}]; N[s1, 200] %t A265305 s2 = Sum[c[[2 k]] - x, {k, 1, z/2}]; N[s2, 200] %t A265305 N[s1 + s2, 200] %t A265305 RealDigits[s1, 10, 120][[1]] (* A265303 *) %t A265305 RealDigits[s2, 10, 120][[1]] (* A265304 *) %t A265305 RealDigits[s1 + s2, 10, 120][[1]](* A265305 *) %Y A265305 Cf. A010466, A265303, A265304, A265288 (guide). %K A265305 nonn,cons %O A265305 1,3 %A A265305 _Clark Kimberling_, Dec 13 2015