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%I #12 May 28 2023 01:38:31
%S 170,426,618,666,678,681,683,686,698,746,938,1450,1642,1690,1702,1705,
%T 1707,1710,1722,1770,1962,2410,2458,2470,2473,2475,2478,2490,2538,
%U 2650,2662,2665,2667,2670,2682,2710,2713,2715,2718
%N Numbers whose base-4 representation contains no 0's and exactly four 2's.
%H Vincenzo Librandi, <a href="/A045041/b045041.txt">Table of n, a(n) for n = 1..4300</a>
%t Select[Range[20000], DigitCount[#, 4, 0] == 0 && DigitCount[#, 4, 2] == 4 &] (* _Vincenzo Librandi_, Sep 23 2016 *)
%Y Cf. A007090.
%K nonn,base
%O 1,1
%A _Clark Kimberling_
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