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 A093728 #23 Feb 16 2025 08:32:53 %S A093728 6,6,8,2,4,4,6,6,1,0,2,7,7,6,2,9,1,1,5,0,6,4,7,5,1,1,6,2,5,3,0,0,9,8, %T A093728 1,1,9,7,0,0,4,9,1,3,3,6,1,9,4,5,8,8,5,5,1,6,4,6,4,8,0,1,9,8,2,4,6,2, %U A093728 9,2,7,0,9,5,2,3,2,8,4,8,0,4,0,1,2,9,5,5,3,2,4,0,5,8,1,9,9,1,0,6,4,5 %N A093728 Decimal expansion of 2E(2i sqrt(2)), where E(k) is the complete elliptic integral of the 2nd kind. %C A093728 Arc length of the trifolium r = a*cos(3*theta). %H A093728 G. C. Greubel, <a href="/A093728/b093728.txt">Table of n, a(n) for n = 1..10000</a> %H A093728 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Trifolium.html">Trifolium</a> %F A093728 Equals 2*A249491. - _Altug Alkan_, Oct 02 2018 %e A093728 6.68244661027762911506475116253009811970049133619458855164648... %p A093728 Re(evalf(2*EllipticE(2*I*sqrt(2)), 120)); # _Vaclav Kotesovec_, Apr 22 2015 %t A093728 RealDigits[ N[ 2*EllipticE[-8], 102]][[1]] (* _Jean-François Alcover_, Oct 29 2012 *) %o A093728 (PARI) 2*intnum(t=0,Pi/2,sqrt(1+8*sin(t)^2)) \\ _Charles R Greathouse IV_, Aug 15 2015 %Y A093728 Cf. A249491. %K A093728 nonn,cons %O A093728 1,1 %A A093728 _Eric W. Weisstein_, Apr 13 2004