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 A027717 #16 Aug 11 2024 14:41:29
%S A027717 4,6,424,40204,48184,68386,4002004,4992994,6510156,6830386,400020004,
%T A027717 424545424,40000200004,41162526114,42314341324,47678687674,
%U A027717 4000002000004,4644626264464,6201427241026,6866949496686,400000020000004,669896222698966,40000000200000004
%N A027717 Palindromes of form k^2 + k + 4.
%H A027717 Giovanni Resta, <a href="/A027717/b027717.txt">Table of n, a(n) for n = 1..36</a>
%H A027717 P. De Geest, <a href="https://www.worldofnumbers.com/quasimor.htm">Palindromic Quasi_Over_Squares of the form n^2+(n+X)</a>
%t A027717 Select[Table[n^2+n+4,{n,0,25*10^5}],IntegerDigits[#] == Reverse[ IntegerDigits[ #]]&] (* _Harvey P. Dale_, Mar 05 2015 *)
%t A027717 Select[Table[n^2+n+4,{n,0,25*10^5}],PalindromeQ] (* _Harvey P. Dale_, Dec 23 2023 *)
%Y A027717 Cf. A027716, A027689, A027715, A027728.
%K A027717 nonn,base
%O A027717 1,1
%A A027717 _Patrick De Geest_
%E A027717 More terms from _Giovanni Resta_, Aug 29 2018