%I #18 May 28 2023 01:39:32
%S 2090,2186,2210,2216,2570,2594,2600,2690,2696,2720,4266,4650,4746,
%T 4770,4776,6186,6282,6306,6312,6666,6690,6696,6786,6792,6816,8298,
%U 8346,8358,8361,8363,8366,8378,8426,8490,8586,8610
%N Numbers whose base-4 representation contains exactly two 0's and four 2's.
%H Enrique Pérez Herrero, <a href="/A045051/b045051.txt">Table of n, a(n) for n = 1..60000</a>
%t Select[Range[4^4, 4^7], {#4, #2} == {2, 4} & @@ DigitCount[#, 4] &] (* _Michael De Vlieger_, Dec 03 2017 *)
%o (Python)
%o import numpy as np
%o for a in range(10000):
%o x = np.base_repr(a, base=4)
%o if(x.count("0") == 2 and x.count("2") == 4):
%o print(a)
%o # _Enrique Pérez Herrero_, Dec 03 2017
%Y Cf. A007090.
%K nonn,base
%O 1,1
%A _Clark Kimberling_