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 A113561 #4 Dec 05 2013 19:57:07 %S A113561 6,16,126,1016,100060,100026,1000006,10000016,100000026,10000000060, %T A113561 10000000076,100000000056,1000000000116,10000000000046, %U A113561 1000000000000065,1000000000000016,10000000000000016,100000000000000026,1000000000000000056 %N A113561 Least multiple of n in which the n-th digit from left is 6. %e A113561 a(4)= 10060, in which the fourth digit is 6. %Y A113561 Cf. A113556, A113557, A113558, A113559, A113560. %K A113561 base,easy,nonn %O A113561 1,1 %A A113561 _Amarnath Murthy_, Nov 06 2005 %E A113561 Corrected and extended by _Joshua Zucker_, May 03 2006