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Numbers whose base-7 representation has the same number of 0's and 3's.
1

%I #14 Jun 20 2021 15:03:00

%S 1,2,4,5,6,8,9,11,12,13,15,16,18,19,20,21,29,30,32,33,34,36,37,39,40,

%T 41,43,44,46,47,48,52,57,58,60,61,62,64,65,67,68,69,70,78,79,81,82,83,

%U 85,86,88,89,90,92,93,95,96,97,101,106,107,109,110,111,113,114,116

%N Numbers whose base-7 representation has the same number of 0's and 3's.

%H Daniel Starodubtsev, <a href="/A039032/b039032.txt">Table of n, a(n) for n = 1..10000</a>

%t Select[Range[200],DigitCount[#,7,0]==DigitCount[#,7,3]&] (* _Harvey P. Dale_, Feb 11 2015 *)

%Y Cf. A007093.

%K nonn,base,easy

%O 1,2

%A _Olivier GĂ©rard_