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%I #14 Jul 30 2022 16:43:16
%S 77,177,277,377,477,577,677,707,717,727,737,747,757,767,770,771,772,
%T 773,774,775,776,778,779,787,797,877,977,1077,1177,1277,1377,1477,
%U 1577,1677,1707,1717,1727,1737,1747,1757,1767,1770,1771
%N Numbers having two 7's in base 10.
%H Daniel Starodubtsev, <a href="/A043518/b043518.txt">Table of n, a(n) for n = 1..10000</a>
%t Select[Range[2000],DigitCount[#,10,7]==2&] (* _Harvey P. Dale_, Jul 30 2022 *)
%Y Subsequence of A011537.
%K nonn,base
%O 1,1
%A _Clark Kimberling_