Integers k such that j(k)*d(k)=phi(k), where j = A033831.

Terms

a(0) =3a(1) =15a(2) =56a(3) =102a(4) =228a(5) =234a(6) =384a(7) =408a(8) =510a(9) =864a(10) =936a(11) =1092a(12) =1140a(13) =1170a(14) =1920a(15) =2040a(16) =4320a(17) =4680a(18) =5460