Numbers m such that phi(m)*tau(m) is a square but phi(m)/tau(m) is not the square of an integer.

Terms

a(0) =54a(1) =1026a(2) =1280a(3) =2187a(4) =2304a(5) =3840a(6) =4352a(7) =6750a(8) =8802a(9) =9072a(10) =9900a(11) =12500a(12) =13056a(13) =13718a(14) =17496a(15) =18700a(16) =21870a(17) =25856a(18) =36900a(19) =37500a(20) =41154a(21) =41553a(22) =47682a(23) =50432a(24) =56100a(25) =57078a(26) =65792a(27) =69700a(28) =77568a(29) =78786