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 A027718 #11 Aug 29 2018 16:56:58
%S A027718 0,1,2,8,12,26,74,127,224,230,2751,3462,4012,4067,12752,22424,27548,
%T A027718 28168,105322,107422,2358150,2724718,2775383,4063892,7569245,85125933,
%U A027718 87579753,106617617,2237334999,2426472519,2765569146,2781875716,2815069131,4029203527
%N A027718 Numbers k such that k^2+k+5 is a palindrome.
%H A027718 Giovanni Resta, <a href="/A027718/b027718.txt">Table of n, a(n) for n = 1..46</a>
%t A027718 palQ[n_] := Block[{d = IntegerDigits[n]}, d == Reverse[d]]; f[n_] := n^2 + n + 5; Select[Range[0, 10^5], palQ@ f@ # &] (* _Giovanni Resta_, Aug 29 2018 *)
%Y A027718 Cf. A027728, A027690, A027754, A027755, A027716, A027729.
%K A027718 nonn,base
%O A027718 1,3
%A A027718 _Patrick De Geest_
%E A027718 More terms from _Giovanni Resta_, Aug 28 2018