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%I #16 Nov 26 2023 15:08:34
%S 1407,1503,1527,1533,1887,1911,1917,2007,2013,2037,3423,3447,3453,
%T 3543,3549,3573,3927,3933,3957,4053,4479,4575,4599,4605,4959,4983,
%U 4989,5079,5085,5109,5247,5343,5367,5373,5439,5567
%N Numbers whose base-4 representation contains exactly three 1's and three 3's.
%H Harvey P. Dale, <a href="/A045127/b045127.txt">Table of n, a(n) for n = 1..1000</a>
%t Select[Range[6000],DigitCount[#,4,1]==DigitCount[#,4,3]==3&] (* _Harvey P. Dale_, Nov 26 2023 *)
%Y Cf. A007090.
%K nonn,base
%O 1,1
%A _Clark Kimberling_
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