%I #13 Apr 23 2023 22:23:19
%S 1600,4001,6402,8803,9832,10175,10518,10861,11008,11057,11106,11155,
%T 11176,11183,11190,11197,11200,11201,11202,11203,11205,11206,11211,
%U 11218,11253,11302,11547,11890,13605,16006,18407
%N Numbers whose base-7 representation contains exactly four 4's.
%Y Cf. A007093.
%K nonn,base
%O 1,1
%A _Clark Kimberling_