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%I #4 Mar 30 2012 17:20:56
%S 3,5,9,25,31,57,116,144,154,288,372,414,624,792,10032
%N phi(a(n)) is equal to the product of (the sum of prime factors and the sum of exponents) of (a(n)-1).
%C Next term if it exists is greater than 100000.
%e phi(25)=20, 24=2^3*3^1, (2+3)*(3+1)=20.
%Y Cf. A000010, A039697.
%K nonn
%O 1,1
%A _Olivier Gérard_
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