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%I #14 Apr 23 2023 21:59:04
%S 2401,4802,7203,9604,12005,14406,16808,16809,16810,16811,16812,16813,
%T 16814,16821,16828,16835,16842,16849,16856,16905,16954,17003,17052,
%U 17101,17150,17493,17836,18179,18522,18865,19208
%N Numbers whose base-7 representation contains exactly four 0's.
%Y Cf. A007093.
%K nonn,base
%O 1,1
%A _Clark Kimberling_