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A265514 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 4. 0
0, 1, 2, 3, 0, 11, 11, 11, 0, 11, 22, 22, 0, 11, 22, 33, 0, 101, 101, 101, 0, 111, 111, 111, 0, 121, 121, 121, 0, 131, 131, 131, 0, 101, 202, 202, 0, 111, 212, 212, 0, 121, 222, 222, 0, 131, 232, 232, 0, 101, 202, 303, 0, 111, 212, 313, 0, 121, 222, 323, 0, 131, 232, 333, 0, 1001, 1001, 1001, 0, 1001, 1001, 1001, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..72.

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: A012652 A012404 A002099 * A219341 A059740 A005160

Adjacent sequences:  A265511 A265512 A265513 * A265515 A265516 A265517

KEYWORD

nonn,base

AUTHOR

N. J. A. Sloane, Dec 09 2015

STATUS

approved

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Last modified March 25 03:50 EDT 2019. Contains 321450 sequences. (Running on oeis4.)