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Numbers whose base-5 representation has an even number of runs.
3

%I #10 May 14 2023 14:23:04

%S 5,7,8,9,10,11,13,14,15,16,17,19,20,21,22,23,25,30,32,33,34,37,43,49,

%T 50,56,60,61,63,64,68,74,75,81,87,90,91,92,94,99,100,106,112,118,120,

%U 121,122,123,125,130,132,133,134,135,136,138,139

%N Numbers whose base-5 representation has an even number of runs.

%t Select[Range[150],EvenQ[Length[Split[IntegerDigits[#,5]]]]&] (* _Harvey P. Dale_, May 14 2023 *)

%K nonn,base

%O 1,1

%A _Clark Kimberling_