Search: id:A066669
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%I A066669
%S A066669 7,9,11,13,14,18,21,22,23,25,26,28,29,33,35,36,39,41,42,44,45,46,47,50,
%T A066669 52,53,55,56,58,59,65,66,69,70,72,75,78,82,83,84,87,88,89,90,92,94,97,
%U A066669 100,104,105,106,107,110,112,113,115,116,118,119,123,130,132,137,138
%N A066669 Numbers n such that Phi[n] = A000010(n) = 2^k*prime for some k >= 0.
%e A066669 7 is here because Phi[7]=6 divided by 2 is prime; 21 is here because 
               Phi[21]=12 divided by 4 is prime; 15 is not here because Phi[15]=8 
               divided by 8 is not prime.
%Y A066669 Cf. A000010, A066670-A066673, A065966.
%Y A066669 Sequence in context: A161992 A167377 A004169 this_sequence A059808 A020742 
               A023389
%Y A066669 Adjacent sequences: A066666 A066667 A066668 this_sequence A066670 A066671 
               A066672
%K A066669 nonn
%O A066669 1,1
%A A066669 Labos E. (labos(AT)ana.sote.hu), Dec 18 2001

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