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%I #19 May 19 2023 04:14:19
%S 9,90,91,92,93,94,95,96,97,98,99,900,901,902,903,904,905,906,907,908,
%T 909,910,911,912,913,914,915,916,917,918,919,920,921,922,923,924,925,
%U 926,927,928,929,930,931,932,933,934,935,936,937,938,939,940,941,942
%N Numbers starting with 9.
%C The lower and upper asymptotic densities of this sequence are 1/81 and 1/9, respectively. - _Amiram Eldar_, Feb 27 2021
%H Jeremy Gardiner, <a href="/A217402/b217402.txt">Table of n, a(n) for n = 1..1111</a>
%H <a href="/index/Ar#10-automatic">Index entries for 10-automatic sequences</a>.
%F a(n) = n + (80*10^floor(log_10(9*n-8))-8)/9. - _Alan Michael Gómez Calderón_, May 17 2023
%t Select[Range[1000], IntegerDigits[#][[1]] == 9 &] (* _T. D. Noe_, Oct 02 2012 *)
%Y Cf. A000981, A011539.
%Y Subsequences include: A077685, A045715, A106419, A106429, A077334.
%Y Cf. A131835, A217394, A217395, A217397, A217398, A217399, A217400, A217401.
%K nonn,base,easy
%O 1,1
%A _Jeremy Gardiner_, Oct 02 2012
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