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

Terms

a(0) =7a(1) =13a(2) =19a(3) =37a(4) =73a(5) =91a(6) =97a(7) =109a(8) =163a(9) =193a(10) =433a(11) =487a(12) =577a(13) =703a(14) =769a(15) =793a(16) =925a(17) =1153a(18) =1297a(19) =1459a(20) =2593a(21) =2917a(22) =3457a(23) =3889a(24) =4699a(25) =5551a(26) =6697a(27) =7999a(28) =8701a(29) =10369