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%I #14 Apr 23 2023 21:59:46
%S 400,2458,2752,2794,2800,2802,2803,2804,2805,2806,2808,2815,2822,2829,
%T 2836,2850,2899,2948,2997,3046,3144,3487,3830,4173,4516,5202,7603,
%U 10004,12405,14806,16864,17158,17200,17206,17208,17209
%N Numbers whose base-7 representation contains exactly four 1's.
%Y Cf. A007093.
%K nonn,base
%O 1,1
%A _Clark Kimberling_