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 A241812 #17 Jul 26 2014 16:40:41
%S A241812 1062489753,1239845706,1256984730,1520843976,1539264870,1597283460,
%T A241812 1684930275,1952843760,1957346028,1978236450,2197480365,2367098415,
%U A241812 2418079653,2503948761,2634980715,2718609453,2735891406,2750483196,2764518903,2854316790,2915768430
%N A241812 Triangular numbers which have one or more occurrences of exactly ten different digits.
%C A241812 The first term having a repeated digit is a(83) = 10075823946.
%C A241812 Superset of A115940. - _R. J. Mathar_, May 02 2014
%H A241812 Charles R Greathouse IV, <a href="/A241812/b241812.txt">Table of n, a(n) for n = 1..10000</a>
%t A241812 Select[Table[(n(n+1))/2,{n,45000,100000}],Min[DigitCount[#]]>0&] (* _Harvey P. Dale_, Jul 26 2014 *)
%o A241812 (PARI) s=[]; for(n=0, 100000, if(#vecsort(eval(Vec(Str(n*(n+1)/2))), , 8)==10, s=concat(s, n*(n+1)/2))); s
%Y A241812 Cf. A045914, A062691, A162304, A241787, A241788, A241789, A241790, A241791, A241792, A000217.
%K A241812 nonn,base,easy
%O A241812 1,1
%A A241812 _Colin Barker_, Apr 29 2014