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A265519
a(n) = largest base-7 palindrome m <= n such that every base-7 digit of m is <= the corresponding digit of n; m is written in base 10.
0
0, 1, 2, 3, 4, 5, 6, 0, 8, 8, 8, 8, 8, 8, 0, 8, 16, 16, 16, 16, 16, 0, 8, 16, 24, 24, 24, 24, 0, 8, 16, 24, 32, 32, 32, 0, 8, 16, 24, 32, 40, 40, 0, 8, 16, 24, 32, 40, 48, 0, 50, 50, 50, 50, 50, 50, 0, 57, 57, 57, 57, 57, 57, 0, 64, 64, 64, 64, 64, 64, 0, 71, 71, 71, 71, 71, 71, 0, 78, 78, 78, 78, 78, 78, 0, 85, 85
OFFSET
0,3
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: A275610 A195830 A080743 * A129835 A356965 A004182
KEYWORD
nonn,base
AUTHOR
N. J. A. Sloane, Dec 09 2015
STATUS
approved