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 A010409 #16 Dec 24 2019 13:14:45 %S A010409 0,1,4,9,16,25,33,36 %N A010409 Squares mod 48. %t A010409 Union[PowerMod[Range[48], 2, 48]] (* _Alonso del Arte_, Dec 24 2019 *) %o A010409 (Sage) [quadratic_residues(48)] # _Zerinvary Lajos_, May 24 2009 %o A010409 (Scala) (1 to 48).map(n => (n * n) % 48).toSet.toSeq.sorted // _Alonso del Arte_, Dec 24 2019 %Y A010409 Cf. A028761. %K A010409 nonn,fini,full,easy %O A010409 1,3 %A A010409 _N. J. A. Sloane_