1,1
phi(54)=18, 54=2^1*3^3, (2+1)*(3+3)=18.
Cf. A000010, A008473.
Sequence in context: A045933 A088986 A118150 this_sequence A044143 A044524 A095962
Adjacent sequences: A039776 A039777 A039778 this_sequence A039780 A039781 A039782
nonn
Olivier Gerard (olivier.gerard(AT)gmail.com)
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