Position of n-th 2 in A030298.

Terms

a(0) =3a(1) =4a(2) =7a(3) =11a(4) =12a(5) =15a(6) =20a(7) =22a(8) =25a(9) =29a(10) =34a(11) =39a(12) =42a(13) =47a(14) =48a(15) =52a(16) =56a(17) =60a(18) =64a(19) =68a(20) =74a(21) =79a(22) =81a(23) =85a(24) =91a(25) =94a(26) =98a(27) =103a(28) =105a(29) =109