Numerators in canonical bijection from positive integers to positive rationals.

Terms

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