Final terms of groups in A075639.

Terms

a(0) =1a(1) =7a(2) =13a(3) =23a(4) =47a(5) =71a(6) =103a(7) =149a(8) =193a(9) =251a(10) =313a(11) =389a(12) =467a(13) =569a(14) =659a(15) =761a(16) =881a(17) =1013a(18) =1129a(19) =1289a(20) =1451a(21) =1601a(22) =1777a(23) =1979a(24) =2153a(25) =2357a(26) =2591a(27) =2789a(28) =3023a(29) =3301