Numbers n such that phi(n) = 4*phi(n+1).

Terms

a(0) =629a(1) =1469a(2) =85139a(3) =100889a(4) =139859a(5) =154979a(6) =168149a(7) =304079a(8) =396899a(9) =838199a(10) =1107413a(11) =1323449a(12) =1465463a(13) =2088839a(14) =2160899a(15) =2504879a(16) =2684879a(17) =2693249a(18) =2800181a(19) =3404609a(20) =3512249a(21) =3576869a(22) =3885881a(23) =4241819a(24) =4500509a(25) =4620659a(26) =4822649a(27) =5530709a(28) =5805449