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Numbers whose base-13 representation has exactly 3 runs.

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`%I #12 Apr 25 2021 12:15:18
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`%S 170,171,172,173,174,175,176,177,178,179,180,181,195,196,198,199,200,
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`%T 201,202,203,204,205,206,207,208,209,210,212,213,214,215,216,217,218,
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`%U 219,220,221,222,223,224,226,227,228,229,230
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`%N Numbers whose base-13 representation has exactly 3 runs.
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`%t Select[Range[250],Length[Split[IntegerDigits[#,13]]]==3&] (* _Harvey P. Dale_, Feb 05 2012 *)
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`%K nonn,base
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`%O 1,1
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`%A _Clark Kimberling_
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