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 A052070 #22 Oct 14 2019 22:26:32
%S A052070 0,7744,100220121,1001481404808481,269996262622969,445646655445456656,
%T A052070 114811414848448481881,425425422552255452244544,
%U A052070 244848282488224248488284224,610016161160606006011116601600
%N A052070 Smallest square all of whose digits occur with the same frequency n.
%H A052070 Patrick De Geest, <a href="http://www.worldofnumbers.com/samedigits.htm">Numbers whose digits occur with same frequency</a>
%e A052070 1001481404808481 (= 31646191^2) and its digits 0, 1, 4 and 8 each occur four times.
%t A052070 Table[i = 0;
%t A052070 While[x = i^2; Union@DeleteCases[DigitCount[x], 0] != {n}, i++];
%t A052070 x, {n, 10}] (* _Robert Price_, Oct 12 2019 *)
%Y A052070 Cf. A052069, A045540, A052046, A052049, A052050, A052072.
%K A052070 nonn,base,more,nice
%O A052070 1,2
%A A052070 _Patrick De Geest_, Jan 15 2000
%E A052070 Two more terms from _Jon E. Schoenfield_, Oct 11 2008
%E A052070 Offset corrected by _Michel Marcus_, Aug 12 2015
%E A052070 a(10) from _Giovanni Resta_, Aug 19 2018