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Numbers whose base-7 representation contains exactly four 4's.
0

%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_