Position of n-th 2 in A030604.

Terms

a(0) =2a(1) =6a(2) =7a(3) =16a(4) =17a(5) =24a(6) =28a(7) =30a(8) =36a(9) =40a(10) =41a(11) =50a(12) =59a(13) =60a(14) =63a(15) =64a(16) =86a(17) =89a(18) =100a(19) =102a(20) =108a(21) =119a(22) =126a(23) =133a(24) =144a(25) =150a(26) =154a(27) =155a(28) =157a(29) =158