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 A090429 #13 Feb 16 2025 08:32:51 %S A090429 100,101,110,111,112,121,122,211,212,221,222,223,232,233,322,323,332, %T A090429 333,334,343,344,433,434,443,444,445,454,455,544,545,554,555,556,565, %U A090429 566,655,656,665,666,667,676,677,766,767,776,777,778,787,788,877,878 %N A090429 3-digit numbers that do not resolve to 495 under the Kaprekar routine. %H A090429 Joseph Myers, <a href="/A090429/b090429.txt">Table of n, a(n) for n=1..60</a> (the full list) %H A090429 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/KaprekarRoutine.html">Kaprekar Routine</a> %H A090429 <a href="/index/K#Kaprekar_map">Index entries for the Kaprekar map</a> %Y A090429 Cf. A069746. %K A090429 nonn,base,fini,full %O A090429 1,1 %A A090429 _Eric W. Weisstein_, Nov 30 2003