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 A169889 #13 Apr 22 2017 17:08:47 %S A169889 0,1,4,5,6,9,100,105,121,126,144,149,164,169,181,186,400,405,424,429, %T A169889 441,446,461,466,484,489,500,501,504,505,506,509,600,605,621,626,644, %U A169889 649,664,669,681,686,900,905,924,929,941,946,961,966,984,989,10000,10005,10104 %N A169889 Numbers that are carryless squares in base 10. %C A169889 A059729 sorted and duplicates removed. %H A169889 N. J. A. Sloane, <a href="/A169889/b169889.txt">Table of n, a(n) for n = 1..5008</a> %H A169889 David Applegate, Marc LeBrun and N. J. A. Sloane, <a href="http://neilsloane.com/doc/carry1.pdf">Carryless Arithmetic (I): The Mod 10 Version</a>. %H A169889 <a href="/index/Ca#CARRYLESS">Index entries for sequences related to carryless arithmetic</a> %Y A169889 Cf. A059729, A169963. %Y A169889 See A087019 (lunar squares) for another version. %K A169889 nonn,base %O A169889 1,3 %A A169889 _David Applegate_, _Marc LeBrun_ and _N. J. A. Sloane_, Jul 06 2010