Least number d such that 10^n -/+ 3d form a prime pair.

Terms

a(0) =1a(1) =1a(2) =3a(3) =23a(4) =43a(5) =13a(6) =87a(7) =71a(8) =153a(9) =11a(10) =19a(11) =13a(12) =89a(13) =219a(14) =119a(15) =459a(16) =1a(17) =129a(18) =633a(19) =131a(20) =71a(21) =217a(22) =1091a(23) =911a(24) =1141a(25) =511a(26) =143a(27) =201a(28) =377a(29) =379