Numbers k such that phi(tau(k)) = sopf(k).

Terms

a(0) =4a(1) =8a(2) =32a(3) =1344a(4) =2016a(5) =2025a(6) =2376a(7) =3375a(8) =3528a(9) =4032a(10) =4224a(11) =4704a(12) =4752a(13) =5292a(14) =5376a(15) =5625a(16) =6084a(17) =6804a(18) =7128a(19) =9408a(20) =9504a(21) =10125a(22) =10206a(23) =10935a(24) =12100a(25) =12348a(26) =12672a(27) =16875a(28) =16896a(29) =20412