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A039044 Numbers whose base-7 representation has the same number of 3's and 4's. 1

%I

%S 0,1,2,5,6,7,8,9,12,13,14,15,16,19,20,25,31,35,36,37,40,41,42,43,44,

%T 47,48,49,50,51,54,55,56,57,58,61,62,63,64,65,68,69,74,80,84,85,86,89,

%U 90,91,92,93,96,97,98,99,100,103,104,105,106,107,110,111,112,113,114

%N Numbers whose base-7 representation has the same number of 3's and 4's.

%H Robert Israel, <a href="/A039044/b039044.txt">Table of n, a(n) for n = 1..10000</a>

%p filter:= proc(n) local L;

%p L:= convert(n,base,7);

%p numboccur(3,L)=numboccur(4,L)

%p end proc:

%p select(filter, [$0..1000]); # _Robert Israel_, Feb 01 2021

%t Select[Range[0,200],DigitCount[#,7,3]==DigitCount[#,7,4]&] (* _Harvey P. Dale_, Feb 07 2019 *)

%Y Cf. A007093.

%K nonn,base,easy

%O 1,3

%A _Olivier GĂ©rard_

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Last modified September 28 06:57 EDT 2021. Contains 347703 sequences. (Running on oeis4.)