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%I
%S 2222,12222,20222,21222,22022,22122,22202,22212,22220,22221,22223,
%T 22224,22225,22226,22227,22228,22229,22232,22242,22252,22262,22272,
%U 22282,22292,22322,22422,22522,22622,22722,22822,22922
%N Numbers n such that number of 2's in base 10 is 4.
%t Select[Range[30000],DigitCount[#,10,2]==4&] (* _Harvey P. Dale_, Oct 05 2012 *)
%K nonn,base
%O 1,1
%A _Clark Kimberling_
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