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 A034025 #8 Jul 08 2025 20:02:32
%S A034025 25,50,125,169,250,289,325,338,425,578,625,650,725,841,845,850,925,
%T A034025 1025,1250,1325,1369,1445,1450,1525,1625,1681,1682,1690,1825,1850,
%U A034025 2050,2125,2197,2225,2425,2525,2650,2725,2738,2809,2825,2873,2890
%N A034025 Both primitively and imprimitively represented by x^2+y^2.
%t A034025 okQ[n_] := (xy = {x, y} /. {ToRules[Reduce[n == x^2 + y^2, {x, y}, Integers]]}; cnt = Count[xy, {x_, y_} /; GCD[x, y] == 1]; Length[xy] > cnt > 0); Reap[For[n = 1, n <= 3000, n++, If[okQ[n], Print[n]; Sow[n]]]][[2, 1]] (* _Jean-François Alcover_, Jan 25 2013 *)
%Y A034025 Cf. A001481, A008784, A022544, A034023-.
%K A034025 nonn
%O A034025 0,1
%A A034025 _N. J. A. Sloane_