Positions of odd numbers in A003325.

Terms

a(0) =2a(1) =5a(2) =7a(3) =9a(4) =12a(5) =14a(6) =15a(7) =17a(8) =20a(9) =22a(10) =24a(11) =27a(12) =29a(13) =30a(14) =32a(15) =36a(16) =38a(17) =40a(18) =41a(19) =42a(20) =45a(21) =48a(22) =50a(23) =52a(24) =53a(25) =55a(26) =59a(27) =61a(28) =63a(29) =65