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A261913 The palindromic order of n (defined in Comments). 4
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 1, 2 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,11

COMMENTS

Order 1: palindromes (A002113);

order 2: not order 1 but is the sum of two palindromes (A261907);

order 3: not order 1 or 2, but n - previous_palindrome(n) (i.e., n - A261914(n)) gives a number of order 2 (A261910);

order 4: not order 1, 2, or 3, but subtracting previous_palindrome(previous_palindrome(n)) gives a number of order 2 (A261911);

order 5: not orders 1, 2, 3, or 4 (A261912).

LINKS

N. J. A. Sloane, Table of n, a(n) for n = 0..20000

CROSSREFS

Cf. A002113, A261423, A261907, A261910, A261911, A261912, A261914.

Closely related to A261675. See also A088601.

Sequence in context: A257474 A257317 A163376 * A088601 A261675 A028950

Adjacent sequences:  A261910 A261911 A261912 * A261914 A261915 A261916

KEYWORD

nonn,base

AUTHOR

N. J. A. Sloane, Sep 10 2015

STATUS

approved

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Last modified September 28 05:33 EDT 2020. Contains 337392 sequences. (Running on oeis4.)