A068065 Palindromes n for which there is a unique k such that n = k + reverse(k).

0, 2, 4, 6, 8, 11, 101, 141, 161, 181, 1001, 10001, 10201, 10401, 10601, 10801, 100001, 1000001, 1002001, 1004001, 1006001, 1008001, 10000001, 100000001, 100020001, 100040001, 100060001, 100080001, 1000000001, 10000000001

Offset

1,2

Comments

Subsequence of A068062; A068062(k) is in this sequence if and only if A068064(k) = 1. At first sight, 121 seems to be missing, but in fact 121 does not belong here (cf. example in A068064).

Links

Table of n, a(n) for n=1..30.

Example

10601 is in the sequence, since 10601 = 10300 + 00301 and for no other k we have 10601 = k + reverse(k).

Crossrefs

Cf. A002113, A067030, A067032, A068062, A068064.

Sequence in context: A061563 A345113 A099994 * A278228 A028328 A360408

Adjacent sequences: A068062 A068063 A068064 * A068066 A068067 A068068

Keyword

base,nonn

Author

Klaus Brockhaus, Feb 16 2002

Status

approved