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 A298740 #18 Sep 08 2022 08:46:20 %S A298740 1,7,9,0,0,4,4,0,1,5,6,7,2,7,5,7,9,8,4,6,7,5,8,5,0,5,4,3,8,5,3,1,8,2, %T A298740 4,5,2,6,0,6,8,4,2,5,1,9,3,0,3,6,5,1,7,2,0,7,2,0,3,7,2,1,8,2,5,1,0,7, %U A298740 0,5,3,2,9,6,0,2,4,5,3,6,2,1,3,1,7,8 %N A298740 Decimal expansion of (1/2)(1 + sqrt(1 + 4*sqrt(2))). %H A298740 Clark Kimberling, <a href="/A298740/b298740.txt">Table of n, a(n) for n = 1..10000</a> %e A298740 constant = 1.7900440156727579847... = positive zero of x^2 - x - sqrt(2). %t A298740 r = (1/2)*(1 + Sqrt[1 + 4*Sqrt[2]]) %t A298740 RealDigits[N[r, 100], 10][[1]]; (* A298740 *) %o A298740 (PARI) (1/2)*(1 + sqrt(1 + 4*sqrt(2))) \\ _Altug Alkan_, Apr 12 2018 %o A298740 (Magma) SetDefaultRealField(RealField(100)); (1/2)*(1 + Sqrt(1 + 4*Sqrt(2))); // _G. C. Greubel_, Aug 20 2018 %Y A298740 Cf. A190179, A298742. %K A298740 nonn,easy,cons %O A298740 1,2 %A A298740 _Clark Kimberling_, Feb 13 2018