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 A298749 #5 Feb 13 2018 19:17:57 %S A298749 2,0,7,6,7,2,6,9,8,2,5,4,9,5,4,3,8,9,4,3,7,4,4,7,1,7,2,9,8,4,5,4,3,2, %T A298749 3,3,1,8,2,1,4,2,6,1,0,1,4,2,5,3,3,9,2,2,9,6,0,2,8,3,2,8,4,2,8,1,8,2, %U A298749 9,8,7,2,2,2,5,4,5,7,1,3,0,5,4,0,5,4 %N A298749 Decimal expansion of (1/2)(1 + sqrt(1 + 4*sqrt(5))). %H A298749 Clark Kimberling, <a href="/A298749/b298749.txt">Table of n, a(n) for n = 1..10000</a> %e A298749 constant = 2.0767269825495438944... = positive zero of x^2 - x - sqrt(5). %t A298749 r = (1/2)*(1 + Sqrt[1 + 4 Sqrt[5]]) %t A298749 RealDigits[N[r, 100], 10][[1]]; (* A298749 *) %Y A298749 Cf. A275828, A298750, A298751, A298752. %K A298749 nonn,easy,cons %O A298749 1,1 %A A298749 _Clark Kimberling_, Feb 13 2018