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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.
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%I #4 Dec 09 2015 20:18:42

%S 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 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 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 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 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