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 A265529 #6 Dec 09 2015 21:40:20 %S A265529 0,1,2,2,4,4,4,4,8,8,10,10,10,13,13,13,16,16,16,16,20,20,20,23,23,23, %T A265529 26,26,28,28,28,28,28,28,28,28,28,28,28,28,40,40,40,40,40,40,40,40,40, %U A265529 40,40,40,52,52,52,52,56,56,56,56,56,56,56,56,56,56,56,56,68,68,68,68,68,68,68,68,68,68,68,68,80,80 %N A265529 Largest base-3 palindrome m <= n, written in base 10. %Y A265529 Sequences related to palindromic floor and ceiling: A175298, A206913, A206914, A261423, A262038, and the large block of consecutive sequences beginning at A265509. %K A265529 nonn,base %O A265529 0,3 %A A265529 _N. J. A. Sloane_, Dec 09 2015