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A265547 a(n) = smallest base-4 palindrome m >= n such that every base-4 digit of n is <= the corresponding digit of m; m is written in base 4. 0
0, 1, 2, 3, 11, 11, 22, 33, 22, 22, 22, 33, 33, 33, 33, 33, 101, 101, 202, 303, 111, 111, 212, 313, 121, 121, 222, 323, 131, 131, 232, 333, 202, 202, 202, 303, 212, 212, 212, 313, 222, 222, 222, 323, 232, 232, 232, 333, 303, 303, 303, 303, 313, 313, 313, 313, 323, 323, 323, 323, 333, 333, 333, 333, 1001, 1001, 2002, 3003, 1111, 1111, 2112, 3113, 1221, 1221, 2222, 3223, 1331, 1331, 2332, 3333 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..79.

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: A127494 A320264 A265563 * A130803 A007932 A035122

Adjacent sequences:  A265544 A265545 A265546 * A265548 A265549 A265550

KEYWORD

nonn,base

AUTHOR

N. J. A. Sloane, Dec 10 2015

STATUS

approved

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Last modified September 17 06:00 EDT 2019. Contains 327119 sequences. (Running on oeis4.)