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A045050 Numbers whose base-4 representation contains exactly two 0's and three 2's. 2

%I #13 May 28 2023 01:36:34

%S 522,546,552,642,648,672,1066,1162,1186,1192,1546,1570,1576,1666,1672,

%T 1696,2074,2086,2089,2091,2094,2106,2122,2146,2152,2182,2185,2187,

%U 2190,2194,2200,2209,2211,2212,2220,2226,2232,2250

%N Numbers whose base-4 representation contains exactly two 0's and three 2's.

%H Vincenzo Librandi, <a href="/A045050/b045050.txt">Table of n, a(n) for n = 1..4000</a>

%t Select[Range[7000], DigitCount[#, 4, 0] == 2 && DigitCount[#, 4, 2] == 3 &] (* _Vincenzo Librandi_, Sep 21 2016 *)

%Y Cf. A007090.

%K nonn,base

%O 1,1

%A _Clark Kimberling_

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Last modified July 21 00:10 EDT 2024. Contains 374461 sequences. (Running on oeis4.)