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%I #11 Apr 25 2021 12:17:03
%S 4112,4114,4115,4116,4117,4118,4119,4120,4121,4122,4123,4124,4125,
%T 4126,4127,4128,4129,4131,4132,4133,4134,4135,4136,4137,4138,4139,
%U 4140,4141,4142,4143,4144,4145,4146,4148,4149,4150
%N Numbers whose base-16 representation has exactly 4 runs.
%t Select[Range[4200],Length[Split[IntegerDigits[#,16]]]==4&] (* _Harvey P. Dale_, Aug 03 2020 *)
%K nonn,base
%O 1,1
%A _Clark Kimberling_
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