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 A227211 #12 Jul 07 2023 14:57:47 %S A227211 3,7,17,18,47,62,99,123,151,305,322,377,551,577,843,1299,1342,2207, %T A227211 2537,3363,3905,4897,5047,5473,5778,7698,7899,10097,11927,15127,17342, %U A227211 19601,20351,23102,27217,31107,39603,43522,46663,93329,98209 %N A227211 Generalized Markoff numbers: largest of 6-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 = 3abcdefg. %e A227211 a(1)=3 and a(2)=7 since (3, 2, 1, 1, 1, 1, 1) and (7, 3, 1, 1, 1, 1, 1) satisfying a^2+b^2+c^2+d^2+e^2+f^2+g^2=3abcdefg with a>=b>=c>=d>=e>=f>=g. a(n) is the first components among all solutions in increasing order. %Y A227211 Cf. A227210, A227212, A227214. %K A227211 nonn,more %O A227211 1,1 %A A227211 _Shanzhen Gao_, Sep 19 2013