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 A217761 #20 Apr 23 2013 11:14:18
%S A217761 0,1,2,3,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,
%T A217761 52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,
%U A217761 75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94
%N A217761 Numbers whose square has a square number of decimal digits.
%e A217761 32^2 is 1024, which has 2^2 = 4 digits.
%o A217761 (R) sq=(1:10)^2; sqsqd=c(); i=0; while(length(sqsqd)<500) { if(floor(log10(i^2)+1)%in%sq) sqsqd=c(sqsqd,i); i=i+1 }
%Y A217761 Cf. A000290, A179935.
%K A217761 nonn,easy,base
%O A217761 1,3
%A A217761 _Kevin L. Schwartz_ and _Christian N. K. Anderson_, Mar 23 2013