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, 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

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: A320264 A335173 A265563 * A130803 A007932 A334054

Adjacent sequences: A265544 A265545 A265546 * A265548 A265549 A265550

Keyword

nonn,base

Author

N. J. A. Sloane, Dec 10 2015

Status

approved