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, 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

Links

Table of n, a(n) for n=0..86.

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

Adjacent sequences: A265510 A265511 A265512 * A265514 A265515 A265516

Keyword

nonn,base

Author

N. J. A. Sloane, Dec 09 2015

Status

approved