Least p with p, q both prime, p+q = 2n.

Terms

a(0) =2a(1) =3a(2) =3a(3) =3a(4) =5a(5) =3a(6) =3a(7) =5a(8) =3a(9) =3a(10) =5a(11) =3a(12) =5a(13) =7a(14) =3a(15) =3a(16) =5a(17) =7a(18) =3a(19) =5a(20) =3a(21) =3a(22) =5a(23) =3a(24) =5a(25) =7a(26) =3a(27) =5a(28) =7a(29) =3