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 A028738 #15 Dec 25 2019 15:31:34 %S A028738 2,3,5,7,8,10,12,13,15,17,18,20,22,23 %N A028738 Nonsquares mod 25. %t A028738 Complement[Range[0, 24], PowerMod[Range[0, 24], 2, 25]] (* _Alonso del Arte_, Nov 25 2019 *) %o A028738 (Scala) val squaresMod25 = (0 to 24).map(n => n * n).map(_ % 25) %o A028738 (0 to 24).diff(squaresMod25) // _Alonso del Arte_, Nov 25 2019 %Y A028738 Cf. A010387. %K A028738 nonn,fini,full,easy %O A028738 1,1 %A A028738 _N. J. A. Sloane_