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 A028802 #13 Jan 24 2020 14:52:30 %S A028802 3,6,7,12,13,14,15,19,23,24,26,27,28,29,30,31,33,35,37,38,41,43,46,48, %T A028802 51,52,54,56,58,59,60,61,62,63,65,66,70,74,75,76,77,82,83,86 %N A028802 Nonsquares mod 89. %t A028802 Select[Range[88], JacobiSymbol[#, 89] == -1 &] (* _Harvey P. Dale_, Mar 01 2015 *) %o A028802 (Scala) (0 to 88).diff((1 to 89).map(n => n * n % 89)) // _Alonso del Arte_, Jan 24 2020 %Y A028802 Cf. A010450 (complement), A096013 (row 89). %K A028802 nonn,fini,full,easy %O A028802 1,1 %A A028802 _N. J. A. Sloane_