Numbers k such that phi(k*sigma(k)) = phi(k)^2.

Terms

a(0) =1a(1) =3a(2) =39a(3) =111a(4) =175a(5) =183a(6) =219a(7) =333a(8) =459a(9) =471a(10) =549a(11) =579a(12) =657a(13) =831a(14) =939a(15) =969a(16) =1191a(17) =1263a(18) =1371a(19) =1413a(20) =1443a(21) =1623a(22) =1737a(23) =1839a(24) =1983a(25) =2019a(26) =2199a(27) =2271a(28) =2379a(29) =2493