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 A274044 #15 Oct 23 2019 10:14:01
%S A274044 65,85,130,145,170,185,205,221,265,290,305,365,370,377,410,442,445,
%T A274044 481,485,493,505,530,533,545,565,610,629,685,689,697,730,745,754,785,
%U A274044 793,865,890,901,905,949,962,965,970,985,986,1010,1037,1066,1073,1090,1105,1130,1145
%N A274044 Squarefree numbers that are the sum of two squares in more than one way.
%C A274044 Squarefree numbers that are the sum of two nonzero squares in more than one way.
%H A274044 Amiram Eldar, <a href="/A274044/b274044.txt">Table of n, a(n) for n = 1..10000</a>
%F A274044 A005117 INTERSECT A007692. - _R. J. Mathar_, Feb 01 2017
%e A274044 65 is a term because 65 = 5*13 = 1^2 + 8^2 = 4^2 + 7^2.
%o A274044 (PARI) isA007692(n) = {nb = 0; lim = sqrtint(n); for (x=1, lim, if ((n-x^2 >= x^2) && issquare(n-x^2), nb++); ); nb >= 2; }
%o A274044 lista(nn) = for(n=1, nn, if(isA007692(n) && issquarefree(n), print1(n, ", ")));
%Y A274044 Cf. A005117, A007692, A020893.
%K A274044 nonn
%O A274044 1,1
%A A274044 _Altug Alkan_, Jun 07 2016