Reduced totient function (divided by 2).

Terms

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