Numbers n such that sigma(uphi(n)) = n where uphi is the unitary totient (or unitary phi) function (see A047994).

A120116

Numbers n such that sigma(uphi(n)) = n where uphi is the unitary totient (or unitary phi) function (see A047994).

Terms

    a(0) =1a(1) =3a(2) =4a(3) =8a(4) =12a(5) =15a(6) =24a(7) =32a(8) =60a(9) =96a(10) =120a(11) =128a(12) =255a(13) =384a(14) =480a(15) =1020a(16) =1920a(17) =2040a(18) =2418a(19) =8160a(20) =8192a(21) =24576a(22) =32640a(23) =65535a(24) =122880a(25) =131072a(26) =262140a(27) =370986a(28) =393216a(29) =524280

External references