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3n appears n times.
2

%I #5 Jul 23 2013 08:51:11

%S 3,6,6,9,9,9,12,12,12,12,15,15,15,15,15,18,18,18,18,18,18,21,21,21,21,

%T 21,21,21,24,24,24,24,24,24,24,24,27,27,27,27,27,27,27,27,27,30,30,30,

%U 30,30,30,30,30,30,30,33,33,33,33,33,33,33,33,33,33,33,36,36,36,36,36

%N 3n appears n times.

%t Flatten[Table[Table[3n,{n}],{n,15}]] (* _Harvey P. Dale_, Jul 23 2013 *)

%Y Cf. A000194, A008585, A111650, A111651.

%K easy,nonn

%O 1,1

%A _Jonathan Vos Post_, Aug 12 2005