Primes formed from concatenating nextprime(n) and n.

Terms

a(0) =53a(1) =2927a(2) =3733a(3) =4139a(4) =5347a(5) =5351a(6) =5953a(7) =6761a(8) =6763a(9) =9791a(10) =113111a(11) =127123a(12) =131129a(13) =137131a(14) =149143a(15) =179173a(16) =191189a(17) =211199a(18) =223211a(19) =223217a(20) =223219a(21) =233231a(22) =239233a(23) =239237a(24) =263257a(25) =277273a(26) =281279a(27) =307301a(28) =331319a(29) =347341