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 A265521 #4 Dec 09 2015 20:19:52 %S A265521 0,1,2,3,4,5,6,7,0,9,9,9,9,9,9,9,0,9,18,18,18,18,18,18,0,9,18,27,27, %T A265521 27,27,27,0,9,18,27,36,36,36,36,0,9,18,27,36,45,45,45,0,9,18,27,36,45, %U A265521 54,54,0,9,18,27,36,45,54,63,0,65,65,65,65,65,65,65,0,73,73,73,73,73,73,73,0,81,81,81,81,81,81,81 %N A265521 a(n) = largest base-8 palindrome m <= n such that every base-8 digit of m is <= the corresponding digit of n; m is written in base 10. %Y A265521 Sequences related to palindromic floor and ceiling: A175298, A206913, A206914, A261423, A262038, and the large block of consecutive sequences beginning at A265509. %K A265521 nonn,base %O A265521 0,3 %A A265521 _N. J. A. Sloane_, Dec 09 2015