Numbers n such that phi(n) * tau(n) divides n^2, but neither tau(n) nor phi(n) divides n.

Terms

a(0) =900a(1) =2400a(2) =3840a(3) =6480a(4) =7200a(5) =11520a(6) =13056a(7) =39168a(8) =42240a(9) =79200a(10) =83232a(11) =96000a(12) =126720a(13) =145200a(14) =153600a(15) =157440a(16) =174240a(17) =195840a(18) =207360a(19) =288000a(20) =300000a(21) =317520a(22) =326592a(23) =387840a(24) =435600a(25) =460800a(26) =472320a(27) =480000a(28) =900000a(29) =971520