

A265546


a(n) = smallest base4 palindrome m >= n such that every base4 digit of n is <= the corresponding base4 digit of m; m is written in base 10.


1



0, 1, 2, 3, 5, 5, 10, 15, 10, 10, 10, 15, 15, 15, 15, 15, 17, 17, 34, 51, 21, 21, 38, 55, 25, 25, 42, 59, 29, 29, 46, 63, 34, 34, 34, 51, 38, 38, 38, 55, 42, 42, 42, 59, 46, 46, 46, 63, 51, 51, 51, 51, 55, 55, 55, 55, 59, 59, 59, 59, 63, 63, 63, 63, 65, 65, 130, 195, 85, 85, 150, 215, 105, 105, 170, 235, 125, 125, 190
(list;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

0,3


LINKS

Jonathan Frech, Table of n, a(n) for n = 0..10000


PROG

(PARI) isok(m, dn) = {my(dm = digits(m, 4)); if ((Vecrev(dm) == dm) && (#dm == #dn), for (i=1, #dn, if (dn[i] > dm[i], return (0))); return(1); ); }
a(n) = {my(dn = digits(n, 4), m = n); while (!isok(m, dn), m++); m; } \\ Michel Marcus, Apr 07 2021


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: A265562 A140312 A088887 * A066911 A326229 A326187
Adjacent sequences: A265543 A265544 A265545 * A265547 A265548 A265549


KEYWORD

nonn,base,changed


AUTHOR

N. J. A. Sloane, Dec 10 2015


STATUS

approved



