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 A241788 #11 Oct 30 2014 11:48:50 %S A241788 10296,12403,13695,14028,14365,14706,16290,17205,19306,19503,21736, %T A241788 21945,23871,24310,24531,24753,24976,27495,29403,30628,30876,32640, %U A241788 32896,34716,34980,37128,37401,37950,39621,40186,41328,41905,42195,43071,43956,46971,47586 %N A241788 Triangular numbers which have one or more occurrences of exactly five different digits. %C A241788 The first term having a repeated digit is 100576. %H A241788 Colin Barker, <a href="/A241788/b241788.txt">Table of n, a(n) for n = 1..1000</a> %o A241788 (PARI) s=[]; for(n=0, 500, if(#vecsort(eval(Vec(Str(n*(n+1)/2))), , 8)==5, s=concat(s, n*(n+1)/2))); s %Y A241788 Cf. A045914, A062691, A162304, A241787, A241789, A241790, A241791, A241792, A241812. %Y A241788 Cf. A000217. %K A241788 nonn,base %O A241788 1,1 %A A241788 _Colin Barker_, Apr 28 2014