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%I #11 Apr 23 2023 21:34:33
%S 171,514,857,1053,1102,1151,1179,1186,1193,1197,1198,1199,1201,1202,
%T 1203,1207,1214,1221,1249,1298,1347,1543,1886,2229,2572,2915,3258,
%U 3454,3503,3552,3580,3587,3594,3598,3599,3600,3602
%N Numbers whose base-7 representation contains exactly three 3's.
%Y Cf. A007093.
%K nonn,base
%O 1,1
%A _Clark Kimberling_