A045040 - OEIS

%I #12 May 28 2023 01:38:40

%S 42,106,154,166,169,171,174,186,234,362,410,422,425,427,430,442,490,

%T 602,614,617,619,622,634,662,665,667,670,677,679,685,687,694,697,699,

%U 702,730,742,745,747,750,762,874,922,934,937,939

%N Numbers whose base-4 representation contains no 0's and exactly three 2's.

%H Vincenzo Librandi, <a href="/A045040/b045040.txt">Table of n, a(n) for n = 1..6000</a>

%t Select[Range[20000], DigitCount[#, 4, 0] == 0 && DigitCount[#, 4, 2] == 3 &] (* _Vincenzo Librandi_, Sep 23 2016 *)

%Y Cf. A007090.

%K nonn,base

%O 1,1

%A _Clark Kimberling_