A265515 - OEIS

%I #4 Dec 09 2015 20:18:11

%S 0,1,2,3,4,0,6,6,6,6,0,6,12,12,12,0,6,12,18,18,0,6,12,18,24,0,26,26,

%T 26,26,0,31,31,31,31,0,36,36,36,36,0,41,41,41,41,0,46,46,46,46,0,26,

%U 52,52,52,0,31,57,57,57,0,36,62,62,62,0,41,67,67,67,0,46,72,72,72,0,26,52,78,78,0,31,57,83,83,0,36

%N a(n) = largest base-5 palindrome m <= n such that every base-5 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