Denominators in a certain bijection from positive integers to positive rationals.

Terms

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