%I #14 May 21 2023 12:22:49
%S 351,375,381,471,477,501,855,861,885,981,1119,1143,1149,1239,1245,
%T 1269,1311,1335,1341,1359,1391,1395,1403,1404,1406,1439,1463,1469,
%U 1479,1485,1491,1499,1500,1502,1511,1517,1521,1524
%N Numbers whose base-4 representation contains exactly three 1's and two 3's.
%t Select[Range[1600],DigitCount[#,4,1]==3&&DigitCount[#,4,3]==2&] (* _Harvey P. Dale_, Jun 20 2017 *)
%Y Cf. A007090.
%K nonn,base
%O 1,1
%A _Clark Kimberling_