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%I #10 May 16 2023 22:05:34
%S 1450,1642,1690,1702,1705,2410,2458,2470,2473,2650,2662,2665,2710,
%T 2713,2725,4522,4714,4762,4774,4777,5290,5674,5770,5794,5800,5803,
%U 5806,5818,5866,6058,6250,6298,6310,6313,6442,6538
%N Numbers whose base-4 representation contains exactly two 1's and four 2's.
%Y Cf. A007090.
%K nonn,base
%O 1,1
%A _Clark Kimberling_