%I #10 Sep 13 2022 13:11:13
%S 511,1023,1535,2047,2559,3071,3583,3647,3711,3775,3839,3903,3967,4031,
%T 4039,4047,4055,4063,4071,4079,4087,4088,4089,4090,4091,4092,4093,
%U 4094,4607,5119,5631,6143,6655,7167,7679,7743,7807
%N Numbers having three 7's in base 8.
%t Select[Range[8000],DigitCount[#,8,7]==3&] (* _Harvey P. Dale_, Sep 13 2022 *)
%Y Cf. A007094.
%K nonn,base
%O 1,1
%A _Clark Kimberling_
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