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 A258654 #10 Jun 16 2015 13:46:03 %S A258654 1,2,1,3,5,4,3,7,6,7,2,4,10,9,5,3,12,10,5,6,15,12,10,18,20,19,15,11, %T A258654 13,22,21,20,15,5,25,23,20,18,3,15,27,5,24,28,2,8,15,14,30,16,15,25, %U A258654 34,33,30,20,12,34,30,15,40,39,38,35,25,30,13,39,23,6,29,18 %N A258654 Suppose A103739(n) = x^2 + y^2 with x < y. The sequence gives values of x. %C A258654 See first comment in A103739. %F A258654 a(n) = (A258653(n) - A258642(n))/2. %e A258654 a(1)=(A258653(1) - A258642(1))/2=(5-3)/2=1; %e A258654 a(2)=(A258653(2) - A258642(2))/2=(7-3)/2=2. %Y A258654 Cf. A103739, A258642, A258653, A257816 (values of y). %K A258654 nonn %O A258654 1,2 %A A258654 _Zak Seidov_, Jun 06 2015