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 A343069 #19 Feb 03 2025 04:57:15 %S A343069 2,3,0,6,0,1,9,3,7,4,8,1,8,7,0,7,2,1,2,5,7,3,8,4,1,0,3,4,5,8,5,2,8,2, %T A343069 9,6,9,3,8,5,2,4,5,5,3,6,2,5,2,7,8,2,9,6,1,6,8,0,9,7,1,0,5,4,2,7,2,4, %U A343069 7,4,9,6,9,2,3,1,5,8,1,4,8,4,0,7,1,9,8,2,1,9,1,8,9 %N A343069 Decimal expansion of 2*(1+5*sqrt(2))/7. %C A343069 Dissect the unit square into 7 regions with equal areas from a given midpoint on the squares edge. This sequence gives the decimal expansion of the perimeter of the triangular region with unit height. %F A343069 Decimal expansion of 2*(1 + k*sqrt(1/k^2 + 1))/k, where k = 7. %e A343069 2.3060193748187072125738410... %t A343069 RealDigits[2 (1 + 5 Sqrt[2])/7, 10, 200][[1]] // Flatten %Y A343069 Similar sequences into k regions: A344520 (k=3), A344554 (k=5), A344568 (k=9), A344569 (k=17). %K A343069 nonn,cons %O A343069 1,1 %A A343069 _Wesley Ivan Hurt_, May 23 2021