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Numbers whose base-3 representation contains exactly four 0's and three 1's.
1

%I #14 Aug 02 2023 21:35:34

%S 733,739,741,757,759,765,811,813,819,837,973,975,981,999,1053,2201,

%T 2203,2209,2219,2221,2225,2229,2233,2235,2245,2251,2253,2273,2275,

%U 2279,2283,2287,2289,2297,2301,2313,2323,2325,2331

%N Numbers whose base-3 representation contains exactly four 0's and three 1's.

%H Paolo Xausa, <a href="/A044988/b044988.txt">Table of n, a(n) for n = 1..10000</a>

%t A044988list[upto_]:=Select[Range[upto],DigitCount[#,3,0]==4&&DigitCount[#,3,1]==3&];A044988list[2500] (* _Paolo Xausa_, Aug 02 2023 *)

%Y Cf. A007089.

%K nonn,base

%O 1,1

%A _Clark Kimberling_