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 A227378 #3 Jul 09 2013 15:04:50 %S A227378 0,1,2,3,4,5,6,7,8,9,19,29,39,49,59,69,79,89,189,289,389,489,589,689, %T A227378 789,1789,2789,3789,4789,5789,6789,16789,26789,36789,46789,56789, %U A227378 156789,256789,356789,456789,1456789,2456789,3456789,13456789,23456789,123456789 %N A227378 Smallest number with n = sum of distinct digits in decimal representation, cf. A217928. %C A227378 A217928(a(n)) = A007953(a(n)) = n and A217928(m) < n for m < a(n). %o A227378 (Haskell) %o A227378 import Data.List (elemIndex); import Data.Maybe (fromJust) %o A227378 a227378 = fromJust . (`elemIndex` a217928_list) %K A227378 nonn,base,fini,full %O A227378 0,3 %A A227378 _Reinhard Zumkeller_, Jul 09 2013