Concatenations of pairs of primes that differ by 8.

Terms

a(0) =311a(1) =513a(2) =1119a(3) =2331a(4) =2937a(5) =5361a(6) =5967a(7) =7179a(8) =8997a(9) =101109a(10) =131139a(11) =149157a(12) =173181a(13) =191199a(14) =233241a(15) =263271a(16) =269277a(17) =359367a(18) =389397a(19) =401409a(20) =431439a(21) =449457a(22) =479487a(23) =491499a(24) =563571a(25) =569577a(26) =593601a(27) =599607a(28) =653661a(29) =683691