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%I #12 Apr 24 2021 21:26:38
%S 999,1999,2999,3999,4999,5999,6999,7999,8999,9099,9199,9299,9399,9499,
%T 9599,9699,9799,9899,9909,9919,9929,9939,9949,9959,9969,9979,9989,
%U 9990,9991,9992,9993,9994,9995,9996,9997,9998,10999
%N Numbers having three 9's in base 10.
%H Daniel Starodubtsev, <a href="/A043527/b043527.txt">Table of n, a(n) for n = 1..10000</a>
%Y Subsequence of A011539.
%K nonn,base
%O 1,1
%A _Clark Kimberling_
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