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%I #13 Apr 23 2023 22:23:10
%S 228,571,914,1257,1404,1453,1502,1551,1572,1579,1586,1593,1596,1597,
%T 1598,1599,1601,1602,1607,1614,1649,1698,1943,2286,2629,2972,3315,
%U 3658,3805,3854,3903,3952,3973,3980,3987,3994,3997
%N Numbers whose base-7 representation contains exactly three 4's.
%Y Cf. A007093.
%K nonn,base
%O 1,1
%A _Clark Kimberling_
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