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 A265303 #8 Dec 18 2015 11:36:14 %S A265303 8,5,7,7,2,0,6,7,6,1,3,6,1,9,1,9,6,6,0,0,4,2,2,2,7,3,5,2,2,6,5,4,4,6, %T A265303 1,4,4,7,9,2,0,3,5,3,0,2,5,1,2,1,6,5,4,9,3,3,6,6,0,5,9,2,0,4,4,6,1,1, %U A265303 3,8,6,2,7,4,1,3,3,0,7,1,7,6,5,2,2,8 %N A265303 Decimal expansion of Sum_{k>=1} (x-c(2k-1)), where c = convergents to (x = sqrt(8)). %e A265303 sum = 0.8577206761361919660042227352265446144... %t A265303 x = Sqrt[8]; z = 600; c = Convergents[x, z]; %t A265303 s1 = Sum[x - c[[2 k - 1]], {k, 1, z/2}]; N[s1, 200] %t A265303 s2 = Sum[c[[2 k]] - x, {k, 1, z/2}]; N[s2, 200] %t A265303 N[s1 + s2, 200] %t A265303 RealDigits[s1, 10, 120][[1]] (* A265303 *) %t A265303 RealDigits[s2, 10, 120][[1]] (* A265304 *) %t A265303 RealDigits[s1 + s2, 10, 120][[1]](* A265305 *) %Y A265303 Cf. A010466, A265304, A265305, A265288 (guide). %K A265303 nonn,cons %O A265303 0,1 %A A265303 _Clark Kimberling_, Dec 13 2015