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 A086307 #19 Feb 16 2025 08:32:50 %S A086307 9,0,4,2,1,6,8,1,2,1,4,1,0,3,9,0,8,5,9,2,3,6,9,7,0,0,1,9,9,2,7,9,7,9, %T A086307 1,9,4,5,4,9,8,7,9,7,6,7,3,3,0,8,9,2,5,2,1,0,9,3,1,4,1,8,1,2,5,2,3,4, %U A086307 9,5,1,3,6,6,5,6,7,7,7,4,8,3,4,9,0,7,1,0,3,9,1,6,6,6,5,1,8,6,5,0,9,0 %N A086307 Decimal expansion of ((4 + 3*log(3))/3)^(2/3)/2. %C A086307 Traveling salesman constant psi. %H A086307 G. C. Greubel, <a href="/A086307/b086307.txt">Table of n, a(n) for n = 0..10000</a> %H A086307 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/TravelingSalesmanConstants.html">Traveling Salesman Constants</a> %H A086307 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a> %e A086307 0.904216812141039085923697001992797919454987976733.... %t A086307 RealDigits[((4 + 3*Log[3])/3)^(2/3)/2, 10, 100][[1]] (* _G. C. Greubel_, Mar 10 2018 *) %o A086307 (PARI) default(realprecision, 100); ((4 + 3*log(3))/3)^(2/3)/2 \\ _G. C. Greubel_, Mar 10 2018 %o A086307 (Magma) SetDefaultRealField(RealField(100)); ((4+3*Log(3))/3)^(2/3)/2; // _G. C. Greubel_, Mar 10 2018 %K A086307 nonn,cons %O A086307 0,1 %A A086307 _Eric W. Weisstein_, Jul 15 2003