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 A291266 #11 Aug 27 2017 23:18:54 %S A291266 111,222,333,444,555,666,777,888,999,1000,1011,1101,1110,1111,1112, %T A291266 1113,1114,1115,1116,1117,1118,1119,1121,1131,1141,1151,1161,1171, %U A291266 1181,1191,1211,1222,1311,1333,1411,1444,1511,1555,1611,1666,1711,1777,1811,1888,1911,1999,2000,2022,2111,2122,2202,2212,2220,2221,2222,2223 %N A291266 Numbers that contain at least 3 identical digits. %t A291266 Select[Range[2500], Max[DigitCount[#]] > 2 &] (* _Giovanni Resta_, Aug 25 2017 *) %K A291266 nonn,base %O A291266 1,1 %A A291266 _Enrique Navarrete_, Aug 21 2017