Initial terms of groups in A075639.

Terms

a(0) =1a(1) =2a(2) =3a(3) =11a(4) =29a(5) =43a(6) =73a(7) =107a(8) =151a(9) =197a(10) =257a(11) =317a(12) =397a(13) =463a(14) =571a(15) =653a(16) =769a(17) =883a(18) =1019a(19) =1151a(20) =1291a(21) =1453a(22) =1607a(23) =1783a(24) =1987a(25) =2143a(26) =2371a(27) =2593a(28) =2791a(29) =3037