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 A227208 #12 Feb 05 2014 20:57:18 %S A227208 3,5,10,18,23,37,39,58,67,119,138,178,181,250,274,307,338,359,515,551, %T A227208 738,778,933,1157,1418,1425,1479,1559,1738,1762,1922,1970,2410,2417, %U A227208 3265 %N A227208 Largest number in an integer 7-tuple (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 = a*b*c*d*e*f*g. %e A227208 3 and 5 are in the sequence since (3, 2, 2, 2, 1, 1, 1) and (5, 2, 2, 2, 1, 1, 1) satisfy a^2+b^2+c^2+d^2+e^2+f^2+g^2 = a*b*c*d*e*f*g with a >= b >= c >= d >= e >= f >= g. %Y A227208 Cf. A002559. %K A227208 nonn %O A227208 1,1 %A A227208 _Shanzhen Gao_, Sep 19 2013