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A043618 Numbers whose base-7 representation has exactly 3 runs. 0

%I #11 Jul 04 2021 14:14:57

%S 50,51,52,53,54,55,63,64,66,67,68,69,70,71,72,74,75,76,77,78,79,80,82,

%T 83,84,85,86,87,88,90,91,92,93,94,95,96,99,100,101,102,103,104,105,

%U 107,108,109,110,111,119,120,121,123,124,125,126

%N Numbers whose base-7 representation has exactly 3 runs.

%t Select[Range[200],Length[Split[IntegerDigits[#,7]]]==3&] (* _Harvey P. Dale_, Jul 04 2021 *)

%Y Cf. A007093.

%K nonn,base

%O 1,1

%A _Clark Kimberling_

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Last modified June 24 08:47 EDT 2024. Contains 373673 sequences. (Running on oeis4.)