A043659 - OEIS

%I #12 Apr 25 2021 12:15:27

%S 2210,2212,2213,2214,2215,2216,2217,2218,2219,2220,2221,2222,2223,

%T 2224,2226,2227,2228,2229,2230,2231,2232,2233,2234,2235,2236,2237,

%U 2238,2240,2241,2242,2243,2244,2245,2246,2247,2248

%N Numbers whose base-13 representation has exactly 4 runs.

%t Select[Range[2300],Length[Split[IntegerDigits[#,13]]]==4&] (* _Harvey P. Dale_, Mar 07 2012 *)

%K nonn,base

%O 1,1

%A _Clark Kimberling_