Search: id:A053568
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%I A053568
%S A053568 2,4,6,6,10,12,6,8,16,18,12,22,20,12,18,28,30,20,16,24,36,18,24,40,42,
%T A053568 24,46,42,20,32,52,40,36,58,60,30,36,48,66,32,44,70,72,36,40,36,60,78,
%U A053568 54,82,64,42,56,88,24,72,60,46,72,96,42,60,100,102,48,106
%N A053568 Totients of non-totient numbers.
%C A053568 See comment at analogous A053474.
%F A053568 a(n)=A000010[A007617[n]]
%e A053568 If n=19 then no number x so that Phi[x]=19,however Phi[19]=18; n=27 is 
               also a non-totient number of which totient is also 18.
%Y A053568 Cf. A000010, A007617.
%Y A053568 Sequence in context: A115947 A061228 A070229 this_sequence A037225 A060685 
               A073353
%Y A053568 Adjacent sequences: A053565 A053566 A053567 this_sequence A053569 A053570 
               A053571
%K A053568 nonn
%O A053568 1,1
%A A053568 Labos E. (labos(AT)ana.sote.hu), Jan 17 2000

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