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 A045084 Numbers n with property that in base 4 representation the numbers of 0's and 3's are 4 and 3, respectively. 1

%I

%S 12303,12339,12348,12483,12492,12528,13059,13068,13104,13248,15363,

%T 15372,15408,15552,16128,16447,16591,16627,16636,17167,17203,17212,

%U 17347,17356,17392,19471,19507,19516,19651,19660

%N Numbers n with property that in base 4 representation the numbers of 0's and 3's are 4 and 3, respectively.

%H Robert Israel, <a href="/A045084/b045084.txt">Table of n, a(n) for n = 1..10000</a>

%p Res:= NULL:

%p for d from 7 to 8 do

%p for i from 0 to d-7 do

%p L:= [0\$4, 3\$3, 1\$i,2\$(d-7-i)];

%p P:= remove(t -> t[-1]=0, combinat:-permute(L));

%p Res:= Res,op(map(t -> add(t[i]*4^(i-1),i=1..d), P));

%p od od:

%p sort([Res]); # _Robert Israel_, Feb 27 2018

%K nonn,base

%O 1,1

%A _Clark Kimberling_

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Last modified December 5 13:26 EST 2019. Contains 329751 sequences. (Running on oeis4.)