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 A010376 #20 Dec 13 2019 14:03:03 %S A010376 0,1,3,4,9,10,12 %N A010376 Squares mod 13. %t A010376 Union[PowerMod[Range[13], 2, 13]] (* _Alonso del Arte_, Dec 13 2019 *) %o A010376 (Sage) [quadratic_residues(13)] # _Zerinvary Lajos_, May 24 2009 %o A010376 (Scala) (1 to 13).map(n => (n * n) % 13).toSet.toSeq.sorted // _Alonso del Arte_, Dec 13 2019 %Y A010376 Row 13 of A096008. %Y A010376 Cf. A028726. %K A010376 nonn,fini,full %O A010376 1,3 %A A010376 _N. J. A. Sloane_