%I #12 May 21 2023 12:23:09
%S 95,119,125,215,221,245,287,311,317,335,367,371,379,380,382,415,439,
%T 445,455,461,467,475,476,478,487,493,497,500,502,505,607,631,637,727,
%U 733,757,791,797,821,839,845,851,859,860,862,871
%N Numbers whose base-4 representation contains exactly two 1's and two 3's.
%Y Cf. A007090.
%K nonn,base
%O 1,1
%A _Clark Kimberling_