%I #11 Mar 27 2022 14:55:08
%S 3390,3392,3393,3394,3395,3396,3397,3398,3399,3400,3401,3402,3403,
%T 3404,3405,3406,3408,3409,3410,3411,3412,3413,3414,3415,3416,3417,
%U 3418,3419,3420,3421,3422,3424,3425,3426,3427,3428
%N Numbers whose base-15 representation has exactly 4 runs.
%t Select[Range[3500],Length[Split[IntegerDigits[#,15]]]==4&] (* _Harvey P. Dale_, Mar 27 2022 *)
%K nonn,base
%O 1,1
%A _Clark Kimberling_