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Numbers whose base-7 representation contains exactly four 3's.
0

%I #12 Apr 23 2023 21:56:21

%S 1200,3601,6002,7374,7717,8060,8256,8305,8354,8382,8389,8396,8400,

%T 8401,8402,8404,8405,8406,8410,8417,8424,8452,8501,8550,8746,9089,

%U 9432,10804,13205,15606,18007,20408,22809,24181,24524

%N Numbers whose base-7 representation contains exactly four 3's.

%Y Cf. A007093.

%K nonn,base

%O 1,1

%A _Clark Kimberling_