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A039381 Numbers whose base-9 representation has the same nonzero number of 3's and 7's. 0

%I #18 Jun 30 2021 02:04:48

%S 34,66,115,147,196,228,250,259,268,286,295,304,306,307,308,310,311,

%T 312,314,322,358,390,439,471,520,552,570,579,588,594,595,596,598,599,

%U 600,602,606,615,624,642,682,714,763,795,844,876,925,957,979,988,997,1015,1024,1033,1035,1036,1037,1039,1040,1041,1043,1051

%N Numbers whose base-9 representation has the same nonzero number of 3's and 7's.

%t okQ[n_]:=Module[{dc3=DigitCount[n,9,3]},dc3>0&&dc3==DigitCount[n,9,7]]

%t Select[Range[2000],okQ] (* _Harvey P. Dale_, Nov 26 2010 *)

%Y Cf. A007095.

%K nonn,base,easy

%O 1,1

%A _Olivier GĂ©rard_

%E More terms from _Harvey P. Dale_, Nov 26 2010

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Last modified July 15 21:59 EDT 2024. Contains 374334 sequences. (Running on oeis4.)