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 A086178 #33 Mar 06 2025 07:12:33 %S A086178 3,8,2,8,4,2,7,1,2,4,7,4,6,1,9,0,0,9,7,6,0,3,3,7,7,4,4,8,4,1,9,3,9,6, %T A086178 1,5,7,1,3,9,3,4,3,7,5,0,7,5,3,8,9,6,1,4,6,3,5,3,3,5,9,4,7,5,9,8,1,4, %U A086178 6,4,9,5,6,9,2,4,2,1,4,0,7,7,7,0,0,7,7,5,0,6,8,6,5,5,2,8,3,1,4,5,4,7 %N A086178 Decimal expansion of 1 + 2*sqrt(2). %C A086178 Onset of 3-cycle in the logistic equation. %H A086178 J. Bechhoefer, <a href="http://www.jstor.org/stable/2690665">The Birth of Period 3, Revisited</a>, Mathematics Magazine pp. 115-8 Vol. 69 No. Apr 02 1996 %H A086178 W. B. Gordon, <a href="http://www.jstor.org/stable/2690666">Period Three Trajectories of the Logistic Map</a>, Mathematics Magazine pp. 118-120 Vol. 69 No. Apr 02 1996 %H A086178 J. Meiss, <a href="https://web.archive.org/web/20060921153247/http://amath.colorado.edu/courses/3010/2002fall/examples/period3.pdf">Period three saddle-node bifurcation for the Logistic Map</a> %H A086178 P. Saha & S. H. Strogatz, <a href="https://www.maa.org/sites/default/files/269137619927.pdf">The Birth of period 3</a>, Mathematics Magazine pp. 42-7 Vol. 68, No. 1, 1995. %H A086178 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/LogisticMap.html">Logistic Map</a> %H A086178 <a href="/index/Al#algebraic_02">Index entries for algebraic numbers, degree 2</a> %F A086178 Equals 1+A010466 . - _R. J. Mathar_, Sep 12 2008 %e A086178 3.8284... %t A086178 RealDigits[1+2Sqrt[2],10,120][[1]] (* _Harvey P. Dale_, Jun 13 2013 *) %o A086178 (PARI) 1+2*sqrt(2) \\ _Felix Fröhlich_, Sep 26 2017 %Y A086178 Cf. A086179. %K A086178 nonn,cons,easy %O A086178 1,1 %A A086178 _Eric W. Weisstein_, Jul 11 2003