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A045028 Numbers whose base-4 representation contains exactly three 0's and no 1's. 1

%I #11 May 28 2023 22:20:12

%S 128,192,514,515,520,524,544,560,640,704,770,771,776,780,800,816,896,

%T 960,2058,2059,2062,2063,2082,2083,2088,2092,2098,2099,2104,2108,2178,

%U 2179,2184,2188,2208,2224,2242,2243,2248,2252

%N Numbers whose base-4 representation contains exactly three 0's and no 1's.

%H Vincenzo Librandi, <a href="/A045028/b045028.txt">Table of n, a(n) for n = 1..1500</a>

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

%Y Cf. A007090.

%K nonn,base

%O 1,1

%A _Clark Kimberling_

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Last modified July 19 01:31 EDT 2024. Contains 374388 sequences. (Running on oeis4.)