Numbers n such that phi(n+1) = 3*phi(n).

Terms

a(0) =6a(1) =12a(2) =18a(3) =36a(4) =72a(5) =90a(6) =96a(7) =108a(8) =162a(9) =192a(10) =432a(11) =486a(12) =576a(13) =702a(14) =768a(15) =792a(16) =924a(17) =1152a(18) =1296a(19) =1458a(20) =2592a(21) =2916a(22) =3456a(23) =3888a(24) =4698a(25) =5550a(26) =6696a(27) =7998a(28) =8700a(29) =10368