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 A265533 #6 Dec 09 2015 21:41:29 %S A265533 0,1,2,3,4,4,6,6,6,6,6,6,12,12,12,12,12,12,18,18,18,18,18,18,24,24,26, %T A265533 26,26,26,26,31,31,31,31,31,36,36,36,36,36,41,41,41,41,41,46,46,46,46, %U A265533 46,46,52,52,52,52,52,57,57,57,57,57,62,62,62,62,62,67,67,67,67,67,72,72,72,72,72,72,78,78,78,78,78 %N A265533 Largest base-5 palindrome m <= n, written in base 10. %Y A265533 Sequences related to palindromic floor and ceiling: A175298, A206913, A206914, A261423, A262038, and the large block of consecutive sequences beginning at A265509. %K A265533 nonn,base %O A265533 0,3 %A A265533 _N. J. A. Sloane_, Dec 09 2015