Primes of the form iii...ijjj...j, i != j.

Terms

a(0) =13a(1) =17a(2) =19a(3) =23a(4) =29a(5) =31a(6) =37a(7) =41a(8) =43a(9) =47a(10) =53a(11) =59a(12) =61a(13) =67a(14) =71a(15) =73a(16) =79a(17) =83a(18) =89a(19) =97a(20) =113a(21) =199a(22) =211a(23) =223a(24) =227a(25) =229a(26) =233a(27) =277a(28) =311a(29) =331