A045106 - OEIS

%I #13 May 14 2023 04:11:40

%S 342,345,357,405,597,1110,1113,1125,1173,1302,1305,1317,1350,1353,

%T 1362,1368,1371,1374,1377,1380,1383,1389,1398,1401,1413,1425,1428,

%U 1431,1437,1461,1494,1497,1509,1557,1605,1617,1620

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

%t Select[Range[2000],DigitCount[#,4,1]==4&&DigitCount[#,4,2]==1&] (* _Harvey P. Dale_, Jan 30 2017 *)

%Y Cf. A007090.

%K nonn,base

%O 1,1

%A _Clark Kimberling_