Numbers k such that phi(k) divides k.

Terms

a(0) =1a(1) =2a(2) =4a(3) =6a(4) =8a(5) =12a(6) =16a(7) =18a(8) =24a(9) =32a(10) =36a(11) =48a(12) =54a(13) =64a(14) =72a(15) =96a(16) =108a(17) =128a(18) =144a(19) =162a(20) =192a(21) =216a(22) =256a(23) =288a(24) =324a(25) =384a(26) =432a(27) =486a(28) =512a(29) =576