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 A029784 #11 Aug 08 2018 18:47:14
%S A029784 4,9,16,49,64,81,289,324,484,576,841,1089,1156,1444,1521,1936,2209,
%T A029784 2809,2916,3249,3364,3481,3844,4489,5184,5929,6241,7056,7744,8464,
%U A029784 8836,20736,24649,24964,29929,34969,35344,36864,37636,43681,44944,50176,56169,56644
%N A029784 Squares such that digits of sqrt(n) are not present in n.
%H A029784 Giovanni Resta, <a href="/A029784/b029784.txt">Table of n, a(n) for n = 1..10000</a>
%F A029784 a(n) = A029783(n)^2. - _Michel Marcus_, Aug 08 2018
%t A029784 Select[Range[500], {} == Intersection @@ IntegerDigits[{#, #^2}] &]^2 (* _Giovanni Resta_, Aug 08 2018 *)
%Y A029784 Cf. A029783, A029785, A029786, A111116, A113316.
%K A029784 nonn,base
%O A029784 1,1
%A A029784 _Patrick De Geest_
%E A029784 More terms from _Giovanni Resta_, Aug 08 2018