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 A241791 #15 Feb 09 2019 12:57:02 %S A241791 10348975,10623745,10725396,10869453,10934826,12347965,12357906, %T A241791 12487503,12647935,12673095,12784096,13862745,14756028,14826735, %U A241791 15237960,15298746,15304278,15879430,16247850,16384950,17084935,17502486,17543926,17829406 %N A241791 Triangular numbers which have one or more occurrences of exactly eight different digits. %C A241791 The first term having a repeated digit is 100642578. %H A241791 Colin Barker, <a href="/A241791/b241791.txt">Table of n, a(n) for n = 1..2000</a> %t A241791 Select[Accumulate[Range[7000]],Length[Union[IntegerDigits[#]]]==8&] (* _Harvey P. Dale_, Feb 09 2019 *) %o A241791 (PARI) s=[]; for(n=0, 7000, if(#vecsort(eval(Vec(Str(n*(n+1)/2))), , 8)==8, s=concat(s, n*(n+1)/2))); s %Y A241791 Cf. A045914, A062691, A162304, A241787, A241788, A241789, A241790, A241792, A241812. %Y A241791 Cf. A000217. %K A241791 nonn,base %O A241791 1,1 %A A241791 _Colin Barker_, Apr 28 2014