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 A028763 #11 Jul 22 2025 13:47:15 %S A028763 2,3,5,7,8,10,12,13,15,17,18,20,22,23,27,28,30,32,33,35,37,38,40,42, %T A028763 43,45,47,48 %N A028763 Nonsquares mod 50. %t A028763 Complement[Range[0, 49], PowerMod[Range[50], 2, 50]] (* _Alonso del Arte_, Dec 25 2019 *) %o A028763 (Scala) (0 to 49).diff((1 to 50).map(n => (n * n) % 50)) // _Alonso del Arte_, Dec 25 2019 %Y A028763 Cf. A010411, A028738 (subsequence). %K A028763 nonn,fini,full,easy %O A028763 1,1 %A A028763 _N. J. A. Sloane_