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 A069669 #3 Dec 05 2013 19:55:17 %S A069669 6,78,496,8778,58996,887778,5897895,88877778,686999778,9876799878, %T A069669 89996788896,777887999778,7798988788878,77779987999896, %U A069669 589598998999878,7898898998885986,78999997699698778,999699998689998991 %N A069669 Smallest n-digit triangular number with maximum digit sum. %Y A069669 Cf. A069661, A069662, A069663, A069664, A069665, A069666, A069667, A069668. %K A069669 nonn,base %O A069669 1,1 %A A069669 _Amarnath Murthy_, Apr 06 2002 %E A069669 More terms from Larry Reeves (larryr(AT)acm.org), Oct 15 2003