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 A083123 #4 Dec 05 2013 20:08:00 %S A083123 1,22,111,2112,50005,201102,1002001,21100112,100070001,10000200001, %T A083123 210000000012,1000029200001,20000055000002,500000020000005, %U A083123 2110000000000112,10000000200000001,200000007700000002,1000000002000000001 %N A083123 Smallest n-digit palindromic multiple of n, or 0 if no such number exists. %K A083123 base,nonn %O A083123 1,2 %A A083123 _Amarnath Murthy_ and Meenakshi Srikanth (menakan_s(AT)yahoo.com), Apr 23 2003 %E A083123 More terms from Keith Schneider, Jun 18 2007