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 A060809 #4 Mar 25 2025 23:16:25 %S A060809 1,8,10,45,297,2322,2728,4445,4544,4949,5049,5455,5554,7172,27100, %T A060809 44443,55556,60434,77778,143857,208494,226071,279720,313390,324675, %U A060809 329967,346060,368928,395604,422577,427868,461539,472823,478115,488214,494208,495208,499500,500500,517076,533170,543752,559846,565137,598807 %N A060809 Erroneous version of A006887. %C A060809 Included in accordance with OEIS policy of including published but incorrect sequences, to serve as pointers to the correct versions. %H A060809 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. %K A060809 dead %O A060809 1,2