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%I #2 Mar 30 2012 17:40:36
%S 1,32,512,3888,8192,25000,62208,131072,314928,400000,759375,995328,
%T 2097152,2839714,3037500
%N n*phi(n)*phi(phi(n)) is a fourth power.
%e 3888*phi(3888)*phi(phi(3888))=216^4.
%Y Cf. A055744, A116002.
%K nonn
%O 1,2
%A _Giovanni Resta_, Feb 13 2006
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