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 A227212 #13 Jul 07 2023 14:57:52 %S A227212 2,3,9,14,43,67,89,206,209,321,881,987,1538,1934,3121,4003,4689,4729, %T A227212 7369,8009,8721,14627,22658,35307,43889,44289,46606,86329,86987 %N A227212 Generalized Markoff numbers: largest of 7-tuple of positive numbers a, b, c, d, e, f, g satisfying the Markoff(7) equation a^2+b^2+c^2+d^2+e^2+f^2+g^2 = 5abcdefg. %e A227212 a(1)=2 and a(2)=3 since (2, 1, 1, 1, 1, 1, 1) and (3, 1, 1, 1, 1, 1, 1) satisfying a^2+b^2+c^2+d^2+e^2+f^2+g^2=5abcdefg. %Y A227212 Cf. A227210, A227211, A227214. %K A227212 nonn,more %O A227212 1,1 %A A227212 _Shanzhen Gao_, Sep 19 2013