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 A265517 #4 Dec 09 2015 20:18:42 %S A265517 0,1,2,3,4,5,0,7,7,7,7,7,0,7,14,14,14,14,0,7,14,21,21,21,0,7,14,21,28, %T A265517 28,0,7,14,21,28,35,0,37,37,37,37,37,0,43,43,43,43,43,0,49,49,49,49, %U A265517 49,0,55,55,55,55,55,0,61,61,61,61,61,0,67,67,67,67,67,0,37,74,74,74,74,0,43,80,80,80,80,0,49,86 %N A265517 a(n) = largest base-6 palindrome m <= n such that every base-6 digit of m is <= the corresponding digit of n; m is written in base 10. %Y A265517 Sequences related to palindromic floor and ceiling: A175298, A206913, A206914, A261423, A262038, and the large block of consecutive sequences beginning at A265509. %K A265517 nonn,base %O A265517 0,3 %A A265517 _N. J. A. Sloane_, Dec 09 2015