This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A382161 #10 Mar 26 2025 08:27:13 %S A382161 1,1111111111,1111111111111111111,1111111111111111111111111111, %T A382161 1111111111111111111111111111111111111, %U A382161 1111111111111111111111111111111111111111111111 %N A382161 "Repunit" Kaprekar numbers. %C A382161 Kaprekar numbers (A006886) all of whose digits are 1's. %C A382161 Not a very interesting sequence in itself, but needed for clarifying A145875. %C A382161 [The data is copied from Gupta (2025); it would be nice to have it confirmed] %H A382161 Shyam Sunder Gupta, <a href="https://doi.org/10.1007/978-981-97-2465-9_9">On Some Marvellous Numbers of Kaprekar</a>, Exploring the Beauty of Fascinating Numbers, Springer (2025) Ch. 9, 275-315. See Section 9.2.2. %Y A382161 Cf. A006886, A145875. %K A382161 nonn,base,more %O A382161 1,2 %A A382161 _N. J. A. Sloane_, Mar 25 2025