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A045030 Numbers whose base-4 representation contains exactly three 0's and two 1's. 1

%I #11 May 28 2023 22:20:20

%S 257,260,272,320,1030,1031,1033,1037,1042,1043,1048,1052,1057,1060,

%T 1073,1076,1090,1091,1096,1100,1120,1136,1153,1156,1168,1217,1220,

%U 1232,1282,1283,1288,1292,1312,1328,1408,1472,1537

%N Numbers whose base-4 representation contains exactly three 0's and two 1's.

%H Vincenzo Librandi, <a href="/A045030/b045030.txt">Table of n, a(n) for n = 1..5700</a>

%t Select[Range[10000], DigitCount[#, 4, 0] == 3 && DigitCount[#, 4, 1] == 2 &] (* _Vincenzo Librandi_, Sep 22 2016 *)

%Y Cf. A007090.

%K nonn,base

%O 1,1

%A _Clark Kimberling_

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Last modified March 29 02:23 EDT 2024. Contains 371264 sequences. (Running on oeis4.)