Primes that are concatenations of n with n + 5.

Terms

a(0) =1217a(1) =1621a(2) =1823a(3) =2833a(4) =4651a(5) =6469a(6) =7681a(7) =7883a(8) =8287a(9) =8893a(10) =102107a(11) =126131a(12) =132137a(13) =138143a(14) =148153a(15) =154159a(16) =178183a(17) =184189a(18) =186191a(19) =196201a(20) =208213a(21) =214219a(22) =226231a(23) =228233a(24) =234239a(25) =246251a(26) =264269a(27) =282287a(28) =288293a(29) =298303