This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A121029 #12 Feb 13 2022 17:51:34 %S A121029 9,90,99,189,198,279,297,369,396,459,495,549,594,639,693,729,792,819, %T A121029 891,900,909,918,927,936,945,954,963,972,981,990,999,1089,1098,1179, %U A121029 1197,1269,1296,1359,1395,1449,1494,1539,1593,1629,1692,1719,1791,1809 %N A121029 Multiples of 9 containing a 9 in their decimal representation. %H A121029 <a href="/index/Ar#10-automatic">Index entries for 10-automatic sequences</a>. %F A121029 a(n) ~ 9n. - _Charles R Greathouse IV_, Feb 12 2017 %t A121029 Select[9*Range[250],DigitCount[#,10,9]>0&] (* _Harvey P. Dale_, Feb 13 2022 *) %o A121029 (PARI) is(n)=n%9==0 && setsearch(Set(digits(n)), 9) \\ _Charles R Greathouse IV_, Feb 12 2017 %Y A121029 Intersection of A008591 and A011539. %Y A121029 Cf. A121041, A011531, A121022, A121023, A121024, A121025, A121026, A121027, A121028, A121030, A121031, A121032, A121033, A121034, A121035, A121036, A121037, A121038, A121039, A121040. %K A121029 nonn,base,easy %O A121029 1,1 %A A121029 _Reinhard Zumkeller_, Jul 21 2006 %E A121029 Corrected by _T. D. Noe_, Oct 25 2006 %E A121029 Typo in comment fixed by _Reinhard Zumkeller_, Aug 13 2010