Numbers k with exactly three distinct prime factors and such that cototient(k) is a square.

Terms

a(0) =345a(1) =465a(2) =468a(3) =1332a(4) =1545a(5) =1833a(6) =1872a(7) =2628a(8) =2737a(9) =2769a(10) =3105a(11) =3145a(12) =3585a(13) =3657a(14) =3945a(15) =4081a(16) =4100a(17) =4185a(18) =4212a(19) =4345a(20) =5328a(21) =6465a(22) =6516a(23) =6785a(24) =6945a(25) =7105a(26) =7488a(27) =8428a(28) =8569a(29) =8625