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 A333133 #8 Mar 09 2020 14:45:14 %S A333133 1,627615,4444444,4927941,5072059,5555556,9372385,9999999 %N A333133 7-Kaprekar numbers. %C A333133 No n-Kaprekar number k can have more than n digits because then the number to the left of the plus sign would have more digits than k itself, meaning the sum will always be greater than k. %e A333133 627615 is in this sequence because inserting a + before the 7th digit from the right of 627615^2 = 393900588225 yields 39390 + 0588225, which equals 627615 (the starting number). %Y A333133 Cf. A006886, A037042, A053394, A053395, A053396, A053397. %K A333133 nonn,fini,full,base %O A333133 1,2 %A A333133 _Eric Fox_, Mar 09 2020