Odd numbers m such that there exists an even number k < m with phi(k) = phi(m).

Terms

a(0) =105a(1) =165a(2) =195a(3) =315a(4) =495a(5) =525a(6) =585a(7) =735a(8) =825a(9) =945a(10) =975a(11) =1155a(12) =1365a(13) =1485a(14) =1575a(15) =1755a(16) =1785a(17) =1815a(18) =1995a(19) =2145a(20) =2205a(21) =2415a(22) =2475a(23) =2535a(24) =2625a(25) =2805a(26) =2835a(27) =2925a(28) =3003a(29) =3045