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a(n) = numbers m such that are not the product of k-th noncomposite number and k for any k >= 1.
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%I #2 Mar 30 2012 19:00:22

%S 2,3,5,6,7,8,10,11,12,13,14,15,16,17,18,19,21,22,23,24,25,26,27,28,29,

%T 30,31,32,33,34,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,

%U 54,55

%N a(n) = numbers m such that are not the product of k-th noncomposite number and k for any k >= 1.

%C Complement of set {A(noncomposite number(n)*n)} = {A164931(n)} = {A(A008578(n)*A000027(n))}.

%K nonn

%O 1,1

%A _Jaroslav Krizek_, Dec 11 2009