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 A027574 #10 Jan 21 2025 19:25:10 %S A027574 77,434,4334,964469,9051509,208666802,776181677,924323429,964777469, %T A027574 4106556014,4906666094,43064746034,90553635509,430495594034, %U A027574 5291716171925,9203225223029,9459406049549,58815733751885,202304919403202,962227252722269,4906073553706094 %N A027574 Palindromes of form n^2 + (n+1)^2 + (n+2)^2. %H A027574 P. De Geest, <a href="https://www.worldofnumbers.com/sumsquare.htm">Palindromic Sums of Squares of Consecutive Integers</a> %t A027574 Select[Total/@Partition[Range[405*10^5]^2,3,1],PalindromeQ] (* _Harvey P. Dale_, Jan 21 2025 *) %Y A027574 Cf. A027573. %K A027574 nonn,base %O A027574 1,1 %A A027574 _Patrick De Geest_ %E A027574 a(18)-a(21) from _Donovan Johnson_, Aug 26 2012