Primes that are decimal concatenations of n with n + 9.

Terms

a(0) =211a(1) =1019a(2) =1423a(3) =2029a(4) =2837a(5) =3847a(6) =4049a(7) =5059a(8) =5261a(9) =5867a(10) =6271a(11) =6473a(12) =7079a(13) =8089a(14) =8291a(15) =100109a(16) =104113a(17) =110119a(18) =112121a(19) =118127a(20) =122131a(21) =124133a(22) =142151a(23) =148157a(24) =160169a(25) =164173a(26) =170179a(27) =172181a(28) =178187a(29) =188197