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 A230713 #9 Oct 29 2013 07:42:34 %S A230713 6,35,198,1081,6121,42372,281987,1816080,11359441,69118332,409120667, %T A230713 2352069720,13087371961,70021883892,454630639122,3083813678879, %U A230713 20184430499034,128112059869885,790520789974362,4746103264506599 %N A230713 Values of y such that x^2 + y^2 = 37^n with x and y coprime and 0 < x < y. %C A230713 The corresponding x-values are in A230712. %e A230713 a(3)=198 because 107^2+198^2=50653=37^3. %Y A230713 Cf. A009981, A188949, A230623, A230645, A230711, A230712. %K A230713 nonn %O A230713 1,1 %A A230713 _Colin Barker_, Oct 28 2013