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Numbers whose base-7 representation has the same number of 3's and 6's.
1

%I #17 Jun 20 2021 15:06:04

%S 0,1,2,4,5,7,8,9,11,12,14,15,16,18,19,27,28,29,30,32,33,35,36,37,39,

%T 40,45,49,50,51,53,54,56,57,58,60,61,63,64,65,67,68,76,77,78,79,81,82,

%U 84,85,86,88,89,94,98,99,100,102,103,105,106,107,109,110,112,113,114

%N Numbers whose base-7 representation has the same number of 3's and 6's.

%H Daniel Starodubtsev, <a href="/A039046/b039046.txt">Table of n, a(n) for n = 1..10000</a>

%t Select[Range[0,150],DigitCount[#,7,3]==DigitCount[#,7,6]&] (* _Harvey P. Dale_, Jul 11 2011 *)

%Y Cf. A007093.

%K nonn,base,easy

%O 1,3

%A _Olivier GĂ©rard_