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 A027576 #15 Aug 11 2024 14:41:29
%S A027576 100,10172,10460137,12309598,101740172,102025300,1085864492,
%T A027576 1086219242,107045858977,109244416317
%N A027576 Numbers n such that n^2 + (n+1)^2 + (n+2)^2 + (n+3)^2 is palindromic.
%H A027576 P. De Geest, <a href="https://www.worldofnumbers.com/sumsquare.htm">Palindromic Sums of Squares of Consecutive Integers</a>
%t A027576 Select[Range[1231*10^4], PalindromeQ[Total[(# + {0, 1, 2, 3})^2]] &] (* The program generates the first 4 terms of the sequence. To generate more, increase the Range constant, but the program will take a long time to run. *) (* _Harvey P. Dale_, Apr 18 2021 *)
%Y A027576 Cf. A027577.
%K A027576 nonn,base
%O A027576 1,1
%A A027576 _Patrick De Geest_
%E A027576 a(6)-a(8) from _Donovan Johnson_, Aug 26 2012
%E A027576 a(9)-a(10) from _Chai Wah Wu_, Sep 06 2021