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%I #12 May 21 2023 12:25:07
%S 22015,22399,22495,22519,22525,23935,24031,24055,24061,24415,24439,
%T 24445,24535,24541,24565,30079,30175,30199,30205,30559,30583,30589,
%U 30679,30685,30709,32095,32119,32125,32215,32221
%N Numbers whose base-4 representation contains exactly four 1's and four 3's.
%Y Cf. A007090.
%K nonn,base
%O 1,1
%A _Clark Kimberling_
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