1,2
72=2^3*3^2 is powerful and 27=3^3.
Cf. A001694, A115694.
Sequence in context: A004165 A032554 A097255 this_sequence A112403 A043932 A064015
Adjacent sequences: A115690 A115691 A115692 this_sequence A115694 A115695 A115696
nonn,base
Giovanni Resta (g.resta(AT)iit.cnr.it), Jan 31 2006
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