A382163 Palindromic Kaprekar numbers.

1, 9, 55, 99, 999, 7777, 9999, 22222, 99999, 999999, 4444444, 9999999, 88888888, 99999999, 909090909, 999999999, 1111111111, 9999999999, 55555555555, 99999999999, 999999999999, 7777777777777, 9999999999999, 22222222222222, 99999999999999, 999999999999999, 4444444444444444, 9999999999999999, 88888888888888888

Offset: 1

Author

N. J. A. Sloane, Mar 26 2025

Keywords

• nonn
• base

Links

• Amiram Eldar, Table of n, a(n) for n = 1..91
• Shyam Sunder Gupta, On Some Marvellous Numbers of Kaprekar, Exploring the Beauty of Fascinating Numbers, Springer (2025) Ch. 9, 275-315.

Crossrefs

Intersection of A002113 and A006886.

Cf. A382164.