Numbers n such that phi(n) = 2*phi(n-2).

Terms

a(0) =3a(1) =4a(2) =5a(3) =8a(4) =17a(5) =32a(6) =257a(7) =512a(8) =527a(9) =992a(10) =1952a(11) =2522a(12) =5252a(13) =6512a(14) =7412a(15) =10376a(16) =23432a(17) =23717a(18) =26732a(19) =27302a(20) =35114a(21) =36632a(22) =37442a(23) =45872a(24) =47027a(25) =49022a(26) =51092a(27) =65537a(28) =78899a(29) =84242