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 A061475 #3 Dec 05 2013 19:54:50 %S A061475 6,60,71,82,93,105,116,127,138,149,204,215,226,237,248,259,303,314, %T A061475 325,336,347,358,369,402,413,424,435,446,457,468,479,501,512,523,534, %U A061475 545,556,567,578,589,600,611,622,633,644,655,666,677,688,699,710,721,732 %N A061475 First (leftmost) digit - second digit + third digit - fourth digit .... = 6. %Y A061475 Cf. A008593, A060978-A060980, A060982, A061470-A061479, A061870-A061882. %K A061475 nonn,base,easy %O A061475 1,1 %A A061475 _Amarnath Murthy_, May 05 2001 %E A061475 More terms from _Robert G. Wilson v_, May 10 2001 and from Larry Reeves (larryr(AT)acm.org), May 14 2001