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A265513
a(n) = largest base-4 palindrome m <= n such that every base-4 digit of m is <= the corresponding digit of n; m is written in base 10.
0
0, 1, 2, 3, 0, 5, 5, 5, 0, 5, 10, 10, 0, 5, 10, 15, 0, 17, 17, 17, 0, 21, 21, 21, 0, 25, 25, 25, 0, 29, 29, 29, 0, 17, 34, 34, 0, 21, 38, 38, 0, 25, 42, 42, 0, 29, 46, 46, 0, 17, 34, 51, 0, 21, 38, 55, 0, 25, 42, 59, 0, 29, 46, 63, 0, 65, 65, 65, 0, 65, 65, 65, 0, 65, 65, 65, 0, 65, 65, 65, 0, 65, 65, 65, 0, 85, 85
OFFSET
0,3
CROSSREFS
Sequences related to palindromic floor and ceiling: A175298, A206913, A206914, A261423, A262038, and the large block of consecutive sequences beginning at A265509.
Sequence in context: A258913 A167485 A294141 * A140508 A063956 A351078
KEYWORD
nonn,base
AUTHOR
N. J. A. Sloane, Dec 09 2015
STATUS
approved