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 A227204 #11 Feb 05 2014 20:58:24 %S A227204 2,4,10,11,23,26,64,68,119,131,134,178,274,373,466,551,779,781,1220, %T A227204 1418,1561,2110,2174,3194,3265,3566,4223,4552,5303,8362,8644,9244, %U A227204 12671,14279,16897,17291,18491,18601,18902,21892,23344,26531,36311,38906,57314,60752,69566,71614,73852 %N A227204 Largest number in a 6-tuple (a,b,c,d,e,f) of positive integers satisfying the Markoff(6) equation a^2 + b^2 + c^2 + d^2 + e^2 + f^2 = 3*a*b*c*d*e*f. %H A227204 Wikipedia, <a href="http://en.wikipedia.org/wiki/Markoff_equation">Markoff number</a> %e A227204 2 is in the sequence since (2, 2, 1, 1, 1, 1) is a solution to a^2 + b^2 + c^2 + d^2 + e^2 + f^2 = 3 *a*b*c*d*e*f. 4, 10, and 11 are in the sequence since (4, 2, 1, 1, 1, 1), (10, 4, 1, 1, 1, 1), (11, 2, 2, 1, 1, 1) are solutions with a>=b>=c>=d>=e>=f>=g. This sequence lists the first components among all solutions in increasing order. %Y A227204 Cf. A002559. %K A227204 nonn %O A227204 1,1 %A A227204 _Shanzhen Gao_, Sep 18 2013