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 A180084 #7 Jul 22 2025 08:24:24 %S A180084 1,2,3,4,5,6,7,8,9,18,99,99999999999 %N A180084 Next smallest n such that digit sum of n >= previous term. %C A180084 a(13) has 11111111111 digits and is too large to be included explicitly. [From _R. J. Mathar_, Aug 10 2010] %e A180084 8 is followed by 9 because 9 is the next lowest number with a digit sum >= 8 %e A180084 9 is followed by 18 because 18 is the next lowest number with a digit sum (1 + 8 = 9) >= 9 %Y A180084 Cf. A180083 %K A180084 nonn,base %O A180084 1,2 %A A180084 _Dominick Cancilla_, Aug 09 2010 %E A180084 a(12) added by _R. J. Mathar_, Aug 10 2010