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 A027577 #12 Aug 11 2024 14:41:29 %S A027577 41214,414000414,437657989756734,606104959401606,41404251615240414, %T A027577 41636648584663614,4716406792976046174,4719488979798849174, %U A027577 45835263697779636253854,47737369987078996373774 %N A027577 Palindromes of form n^2 + (n+1)^2 + (n+2)^2 + (n+3)^2. %H A027577 P. De Geest, <a href="https://www.worldofnumbers.com/sumsquare.htm">Palindromic Sums of Squares of Consecutive Integers</a> %Y A027577 Cf. A027576. %K A027577 nonn,base %O A027577 1,1 %A A027577 _Patrick De Geest_ %E A027577 a(6)-a(8) from _Donovan Johnson_, Aug 26 2012 %E A027577 a(9)-a(10) from _Chai Wah Wu_, Sep 06 2021