%I
%S 4,15,255,5865,170085,5437705,226473065,10380578845,494390700895,
%T 43592479037107
%N Minimal value w such that A051953(w) = w  Phi(w) is prime and w has n prime divisors.
%C a(11) <= 2995513256722805.  _Donovan Johnson_, Feb 06 2010
%e a(1)=2^2, a(2)=3*5, a(3)=3*5*17, a(4)=3*5*17*23, a(5)=3*5*17*23*29, a(6)=5437705=5*7*13*17*19*37 with 1,2,3,4,5,6 prime divisors, respectively. The generated primes of form w  Phi(w) are as follows: 2, 7, 127, 3049, 91237, 2452721.
%Y Cf. A051953, A050530.
%K nonn
%O 1,1
%A _Labos Elemer_, Jan 05 2000
%E a(7)a(10) from _Donovan Johnson_, Feb 06 2010
