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 A121030 #15 Feb 26 2024 09:21:30 %S A121030 10,100,110,210,310,410,510,610,710,810,910,1000,1010,1020,1030,1040, %T A121030 1050,1060,1070,1080,1090,1100,1110,1210,1310,1410,1510,1610,1710, %U A121030 1810,1910,2010,2100,2110,2210,2310,2410,2510,2610,2710,2810,2910,3010,3100 %N A121030 Multiples of 10 containing a 10 in their decimal representation. %H A121030 R. Zumkeller, <a href="/A121030/b121030.txt">Table of n, a(n) for n = 1..10000</a> %H A121030 <a href="/index/Ar#10-automatic">Index entries for 10-automatic sequences</a>. %F A121030 a(n) ~ 10n. - _Charles R Greathouse IV_, Feb 12 2017 %t A121030 Select[10*Range[1000], StringContainsQ[IntegerString[#], "10"] &] (* _Paolo Xausa_, Feb 25 2024 *) %Y A121030 Cf. A121041, A008592, A011531, A121022, A121023, A121024, A121025, A121026, A121027, A121028, A121029, A121031, A121032, A121033, A121034, A121035, A121036, A121037, A121038, A121039, A121040. %K A121030 nonn,base,easy %O A121030 1,1 %A A121030 _Reinhard Zumkeller_, Jul 21 2006