A045103 - OEIS

%I #14 May 14 2023 04:10:22

%S 1386,1434,1446,1449,1626,1638,1641,1686,1689,1701,2394,2406,2409,

%T 2454,2457,2469,2646,2649,2661,2709,4458,4506,4518,4521,4698,4710,

%U 4713,4758,4761,4773,5226,5274,5286,5289,5418,5514

%N Numbers whose base-4 representation contains exactly three 1's and three 2's.

%t Select[Range[6000],DigitCount[#,4,1]==DigitCount[#,4,2]==3&] (* _Harvey P. Dale_, Sep 10 2011 *)

%Y Cf. A007090.

%K nonn,base

%O 1,1

%A _Clark Kimberling_