Erroneous version of A074721.

Terms

a(0) =2a(1) =3a(2) =5a(3) =7a(4) =11a(5) =13a(6) =17a(7) =19a(8) =23a(9) =2a(11) =271a(12) =31a(13) =13a(14) =7a(15) =13a(16) =91491511a(17) =571a(18) =631a(19) =67a(20) =17a(21) =3a(22) =17a(23) =9181a(24) =19a(25) =11a(26) =9319a(27) =7a(28) =19