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a(n) = largest base-9 palindrome m <= n such that every base-9 digit of m is <= the corresponding digit of n; m is written in base 9.
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%I #4 Dec 09 2015 20:25:58

%S 0,1,2,3,4,5,6,7,8,0,11,11,11,11,11,11,11,11,0,11,22,22,22,22,22,22,

%T 22,0,11,22,33,33,33,33,33,33,0,11,22,33,44,44,44,44,44,0,11,22,33,44,

%U 55,55,55,55,0,11,22,33,44,55,66,66,66,0,11,22,33,44,55,66,77,77,0,11,22,33,44,55,66,77,88,0,101,101

%N a(n) = largest base-9 palindrome m <= n such that every base-9 digit of m is <= the corresponding digit of n; m is written in base 9.

%Y Sequences related to palindromic floor and ceiling: A175298, A206913, A206914, A261423, A262038, and the large block of consecutive sequences beginning at A265509.

%K nonn,base

%O 0,3

%A _N. J. A. Sloane_, Dec 09 2015