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Numbers n such that number of runs in the base 4 representation of n is congruent to 7 mod 9.
1

%I #7 Aug 16 2024 17:03:00

%S 4369,4370,4371,4376,4377,4379,4380,4381,4382,4385,4386,4387,4388,

%T 4390,4391,4396,4397,4398,4401,4402,4403,4404,4406,4407,4408,4409,

%U 4411,4484,4486,4487,4488,4489,4491,4492,4493,4494

%N Numbers n such that number of runs in the base 4 representation of n is congruent to 7 mod 9.

%t Select[Range[4500],Mod[Length[Split[IntegerDigits[#,4]]],9]==7&] (* _Harvey P. Dale_, Aug 16 2024 *)

%K nonn,base

%O 1,1

%A _Clark Kimberling_