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 A241790 #11 Oct 30 2014 11:48:33 %S A241790 1024596,1047628,1053426,1069453,1073845,1078246,1203576,1234806, %T A241790 1345620,1360425,1362075,1386945,1390278,1405326,1430586,1439056, %U A241790 1462905,1486950,1493856,1547920,1549680,1590436,1602945,1624503,1642578,1679028,1684530,1693720 %N A241790 Triangular numbers which have one or more occurrences of exactly seven different digits. %C A241790 The first term having a repeated digit is 10149765. %H A241790 Colin Barker, <a href="/A241790/b241790.txt">Table of n, a(n) for n = 1..2000</a> %o A241790 (PARI) s=[]; for(n=0, 2500, if(#vecsort(eval(Vec(Str(n*(n+1)/2))), , 8)==7, s=concat(s, n*(n+1)/2))); s %Y A241790 Cf. A045914, A062691, A162304, A241787, A241788, A241789, A241791, A241792, A241812. %Y A241790 Cf. A000217. %K A241790 nonn,base %O A241790 1,1 %A A241790 _Colin Barker_, Apr 28 2014