Primes formed from the concatenation of n and nextprime(n).

Terms

a(0) =23a(1) =67a(2) =811a(3) =911a(4) =1213a(5) =2729a(6) =3137a(7) =3637a(8) =4243a(9) =4447a(10) =4547a(11) =5153a(12) =5659a(13) =6367a(14) =6871a(15) =6971a(16) =7879a(17) =8389a(18) =8689a(19) =9397a(20) =9497a(21) =9697a(22) =98101a(23) =102103a(24) =104107a(25) =105107a(26) =108109a(27) =115127a(28) =117127a(29) =118127