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 A341030 #12 Jun 28 2023 08:21:29 %S A341030 4,1,2,9,2,7,3,1,0,0,1,5,3,7,0,8,2,2,7,8,5,9,3,1,4,8,3,2,9,2,3,6,2,8, %T A341030 0,5,4,7,7,7,2,3,7,8,1,6,1,3,8,2,6,3,8,3,1,0,2,9,8,0,3,7,5,8,4,3,4,4, %U A341030 6,0,4,9,5,4,4,4,2,9,4,9,7,2,5,0,7,4,8,4,2,6,7,4,5,8,4,3,8,4,3,1,6,1,8,2,9 %N A341030 Decimal expansion of the perimeter of the convex hull around the dragon curve fractal. %C A341030 Benedek and Panzone determine the 10 vertices of the polygon which is the convex hull around the dragon fractal. The perimeter follows from these. %H A341030 Kevin Ryde, <a href="/A341030/b341030.txt">Table of n, a(n) for n = 1..10000</a> %H A341030 Agnes I. Benedek and Rafael Panzone, <a href="https://inmabb.criba.edu.ar/revuma/pdf/v39n1y2/p076-089.pdf">On Some Notable Plane Sets, II: Dragons</a>, Revista de la Unión Matemática Argentina, volume 39, numbers 1-2, 1994, pages 76-90. %H A341030 Kevin Ryde, <a href="http://user42.tuxfamily.org/dragon/index.html">Iterations of the Dragon Curve</a>, see index "HBf". %F A341030 Equals 3/2 + (5/6)*sqrt(2) + (1/6)*sqrt(13) + (1/6)*sqrt(26). %F A341030 Equals 2/3 + (1 + sqrt(2))*(5 + sqrt(13))/6. %F A341030 Largest root of 81*x^4 - 486*x^3 + 693*x^2 - 282*x + 17 = 0 (all its roots are real). %e A341030 4.1292731001... %t A341030 RealDigits[2/3 + (1 + Sqrt[2])*(5 + Sqrt[13])/6, 10, 120][[1]] (* _Amiram Eldar_, Jun 28 2023 *) %Y A341030 Cf. A341029 (finite hull areas). %K A341030 cons,nonn %O A341030 1,1 %A A341030 _Kevin Ryde_, Feb 02 2021