A335978 -id:A335978 - cp's OEIS frontend

A334145 a(n) = A335978(n)/9.

0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 20, 21, 22, 30, 31, 33, 40, 41, 44, 50, 51, 55, 60, 61, 66, 70, 71, 77, 80, 81, 88, 90, 91, 99, 100, 101, 110, 111, 121, 131, 132, 141, 142, 151, 152, 161, 162, 171, 172, 181, 182, 191, 192, 200, 201, 202, 210, 212, 220, 221, 222, 231

Offset: 1

N. J. A. Sloane, Jul 25 2020

Cf. A335978.

A008920 Let j = | i - i_written_backwards |, k = j + j_written_backwards; then k is in this sequence.

Original entry on oeis.org

0, 18, 99, 198, 261, 342, 423, 504, 585, 666, 747, 828, 909, 1089, 1170, 1251, 1332, 1413, 1494, 1575, 1656, 1737, 1818, 1881, 1998, 2772, 2871, 3663, 3762, 4554, 4653, 5445, 5544, 6336, 6435, 7227, 7326, 8118, 8217, 9009, 9108, 9999, 10890, 10989, 11781

Offset: 1

N. J. A. Sloane and J. H. Conway

There were originally some terms missing from this sequence, for example 909 generated from 101001. It seems likely to me that Conway only checked generators up to 100000. It's possible to prove that there are now no missing terms of the sequence by noting that if an n-digit number is not a palindrome then the difference between it and its reversal is at least 9*10^(n/2 - 1). - Oscar Cunningham, Sep 10 2021

J. H. Conway, personal communication.

Oscar Cunningham, Table of n, a(n) for n = 1..30484

Cf. A004086, A335978.

Offset 1 and missing terms added by Oscar Cunningham, Sep 10 2021

cp's OEIS Frontend

A334145 a(n) = A335978(n)/9.

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A008920 Let j = | i - i_written_backwards |, k = j + j_written_backwards; then k is in this sequence.

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