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 A028762 #14 Jan 08 2020 09:47:45 %S A028762 3,5,6,7,10,12,13,14,17,19,20,21,24,26,27,28,31,33,34,35,38,40,41,42, %T A028762 45,47,48 %N A028762 Nonsquares mod 49. %C A028762 First half of the elements of A028811. - _R. J. Mathar_, Oct 23 2008 %t A028762 Complement[Range[0, 48], PowerMod[Range[49], 2, 49]] (* _Alonso del Arte_, Jan 07 2020 *) %o A028762 (Scala) (0 to 48).diff((1 to 49).map(n => n * n % 49)) // _Alonso del Arte_, Jan 07 2020 %Y A028762 Cf. A010410, A028811. %K A028762 nonn,fini,full,easy %O A028762 1,1 %A A028762 _N. J. A. Sloane_