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 A010450 #20 Jan 24 2020 14:52:46
%S A010450 0,1,2,4,5,8,9,10,11,16,17,18,20,21,22,25,32,34,36,39,40,42,44,45,47,
%T A010450 49,50,53,55,57,64,67,68,69,71,72,73,78,79,80,81,84,85,87,88
%N A010450 Squares mod 89.
%t A010450 Join[{0}, Select[Range[100], JacobiSymbol[#, 89] == 1 &]] (* _Harvey P. Dale_, Jan 27 2012 *)
%o A010450 (Sage) [quadratic_residues(89)] # _Zerinvary Lajos_, May 28 2009
%o A010450 (Scala) (1 to 89).map(n => n * n % 89).toSet.toSeq.sorted // _Alonso del Arte_, Jan 24 2020
%Y A010450 Cf. A028802.
%K A010450 nonn,fini,full,easy
%O A010450 1,3
%A A010450 _N. J. A. Sloane_