a(n) = gcd(n, phi(n)).

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =1a(5) =2a(6) =1a(7) =4a(8) =3a(9) =2a(10) =1a(11) =4a(12) =1a(13) =2a(14) =1a(15) =8a(16) =1a(17) =6a(18) =1a(19) =4a(20) =3a(21) =2a(22) =1a(23) =8a(24) =5a(25) =2a(26) =9a(27) =4a(28) =1a(29) =2