2i + 1 such that A039508(i) = 2.

Terms

a(0) =7a(1) =19a(2) =21a(3) =31a(4) =41a(5) =43a(6) =53a(7) =57a(8) =63a(9) =67a(10) =89a(11) =93a(12) =107a(13) =109a(14) =113a(15) =123a(16) =129a(17) =139a(18) =157a(19) =159a(20) =171a(21) =179a(22) =189a(23) =197a(24) =201a(25) =211a(26) =227a(27) =267a(28) =271a(29) =277