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 A010462 #27 Nov 30 2019 16:45:24 %S A010462 0,1,4,6,9,10,15,16,19,21,24,25 %N A010462 Squares mod 30. %C A010462 Range of A070452; a(k) + a(13-k) = 25, 1 <= k <= 12. - _Reinhard Zumkeller_, Apr 24 2009 %e A010462 3^2 = 9, so 9 is in the sequence. %e A010462 10^2 and 20^2 are both congruent to 10 mod 30, so 10 is in the sequence. %e A010462 There are no solutions to x^2 = 11 mod 30, so 11 is not in the sequence. %t A010462 Union[PowerMod[Range[30], 2, 30]] (* _Alonso del Arte_, Jan 30 2018 *) %o A010462 (Sage) [quadratic_residues(30)] # _Zerinvary Lajos_, May 24 2009 %o A010462 (Scala) (1 to 30).map(n => n * n).map(_ % 30).toSet.toSeq.sorted // _Alonso del Arte_, Nov 30 2019 %Y A010462 Cf. A010378, A010382, A010421. - _Reinhard Zumkeller_, Apr 24 2009 %Y A010462 Row 30 of A096008. %Y A010462 Cf. A028743. %K A010462 nonn,fini,full %O A010462 1,3 %A A010462 _N. J. A. Sloane_