Numerators in canonical bijection from positive integers to positive rationals.

Terms

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