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 A027729 #25 Sep 08 2022 08:44:49
%S A027729 0,1,24,25,28,288,2485,2550,2888,2946,28888,146777,264334,288888,
%T A027729 292276,2834101,2873233,2888888,2952316,2960816,2985943,2995631,
%U A027729 14604657,16353547,28888888,29190748,29585508,148278137,264056434,288888888,2853889203,2931604151,28988127118
%N A027729 Numbers k such that k^2+k+6 is a palindrome.
%H A027729 Patrick De Geest, <a href="http://www.worldofnumbers.com/quasimor.htm">Palindromic Quasi_Over_Squares of the form n^2+(n+X)</a>
%t A027729 palOblongPlus6Q[n_] := Module[{d = IntegerDigits[n^2 + n + 6]}, d == Reverse[d]]; Select[Range[0, 3000000], palOblongPlus6Q] (* _Harvey P. Dale_, Nov 14 2012 *)
%o A027729 (Magma) [n: n in [0..3*10^6] | Intseq(n^2+n+6) eq Reverse(Intseq(n^2+n+6))]; // _Vincenzo Librandi_, Jun 16 2016
%Y A027729 Cf. A027721, A027691, A027718, A027722.
%K A027729 nonn,base
%O A027729 1,3
%A A027729 _Patrick De Geest_
%E A027729 a(23)-a(33) from _Giovanni Resta_, Aug 27 2018