Position of n-th 1 in A003137.

Terms

a(0) =1a(1) =3a(2) =5a(3) =6a(4) =7a(5) =12a(6) =15a(7) =18a(8) =20a(9) =21a(10) =24a(11) =25a(12) =27a(13) =28a(14) =29a(15) =30a(16) =31a(17) =33a(18) =36a(19) =38a(20) =39a(21) =47a(22) =52a(23) =55a(24) =56a(25) =58a(26) =65a(27) =69a(28) =73a(29) =76