Positions of odd numbers in A003072.

Terms

a(0) =1a(1) =3a(2) =5a(3) =7a(4) =8a(5) =11a(6) =13a(7) =15a(8) =17a(9) =18a(10) =21a(11) =22a(12) =23a(13) =25a(14) =28a(15) =31a(16) =34a(17) =35a(18) =38a(19) =39a(20) =41a(21) =45a(22) =46a(23) =48a(24) =50a(25) =51a(26) =53a(27) =54a(28) =56a(29) =57