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

%I #12 May 28 2023 22:20:32

%S 512,768,2050,2051,2056,2060,2080,2096,2176,2240,2560,2816,3074,3075,

%T 3080,3084,3104,3120,3200,3264,3584,3840,8202,8203,8206,8207,8226,

%U 8227,8232,8236,8242,8243,8248,8252,8322,8323,8328

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

%H Vincenzo Librandi, <a href="/A045033/b045033.txt">Table of n, a(n) for n = 1..2000</a>

%t Select[Range[10000], DigitCount[#, 4, 0] == 4 && DigitCount[#, 4, 1] == 0 &] (* _Vincenzo Librandi_, Sep 23 2016 *)

%Y Cf. A007090.

%K nonn,base

%O 1,1

%A _Clark Kimberling_