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A241788 Triangular numbers which have one or more occurrences of exactly five different digits. 7

%I #11 Oct 30 2014 11:48:50

%S 10296,12403,13695,14028,14365,14706,16290,17205,19306,19503,21736,

%T 21945,23871,24310,24531,24753,24976,27495,29403,30628,30876,32640,

%U 32896,34716,34980,37128,37401,37950,39621,40186,41328,41905,42195,43071,43956,46971,47586

%N Triangular numbers which have one or more occurrences of exactly five different digits.

%C The first term having a repeated digit is 100576.

%H Colin Barker, <a href="/A241788/b241788.txt">Table of n, a(n) for n = 1..1000</a>

%o (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 Cf. A045914, A062691, A162304, A241787, A241789, A241790, A241791, A241792, A241812.

%Y Cf. A000217.

%K nonn,base

%O 1,1

%A _Colin Barker_, Apr 28 2014

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Last modified April 24 10:11 EDT 2024. Contains 371935 sequences. (Running on oeis4.)