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Numbers whose base-8 representation has exactly 4 runs.
1

%I #13 Apr 25 2021 12:10:27

%S 520,522,523,524,525,526,527,528,529,531,532,533,534,535,536,537,538,

%T 540,541,542,543,544,545,546,547,549,550,551,552,553,554,555,556,558,

%U 559,560,561,562,563,564,565,567,568,569,570

%N Numbers whose base-8 representation has exactly 4 runs.

%H Harvey P. Dale, <a href="/A043626/b043626.txt">Table of n, a(n) for n = 1..1000</a>

%t Select[Range[600],Length[Split[IntegerDigits[#,8]]]==4&] (* _Harvey P. Dale_, Jun 18 2019 *)

%Y Cf. A007094.

%K nonn,base

%O 1,1

%A _Clark Kimberling_