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Numbers having one 7 in base 10.
11

%I #17 Apr 24 2021 21:16:39

%S 7,17,27,37,47,57,67,70,71,72,73,74,75,76,78,79,87,97,107,117,127,137,

%T 147,157,167,170,171,172,173,174,175,176,178,179,187,197,207,217,227,

%U 237,247,257,267,270,271,272,273,274,275,276

%N Numbers having one 7 in base 10.

%H Enrique Pérez Herrero, <a href="/A043517/b043517.txt">Table of n, a(n) for n = 1..2000</a>

%H <a href="/index/Ar#10-automatic">Index entries for 10-automatic sequences</a>.

%t Select[Range[9000],DigitCount[#,10,7]==1&]

%Y Cf. A043489, A043493, A043497, A043501, A043505, A043509, A043513, A043521, A043525, A011537.

%K nonn,base,easy

%O 1,1

%A _Clark Kimberling_