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 A069670 #3 Dec 05 2013 19:55:17 %S A069670 6,78,946,8778,58996,998991,9979278,98989485,886899786,9998888991, %T A069670 89996788896,999998497578,9869988988965,99989985868878, %U A069670 988895779999896,9999678588989986,99889886986899778,999699998689998991 %N A069670 Largest n-digit triangular number with maximum digit sum. %Y A069670 Cf. A069661, A069662, A069663, A069664, A069665, A069666, A069667, A069668, A069669. %K A069670 nonn,base %O A069670 1,1 %A A069670 _Amarnath Murthy_, Apr 06 2002 %E A069670 More terms from Larry Reeves (larryr(AT)acm.org), Oct 15 2003