Numbers n such that tau(phi(n))= phi(rad(n)).

Terms

a(0) =1a(1) =2a(2) =3a(3) =6a(4) =20a(5) =28a(6) =45a(7) =75a(8) =90a(9) =147a(10) =150a(11) =169a(12) =176a(13) =189a(14) =208a(15) =252a(16) =294a(17) =336a(18) =338a(19) =378a(20) =480a(21) =608a(22) =792a(23) =875a(24) =1400a(25) =1444a(26) =1521a(27) =1715a(28) =1750a(29) =1960