Primes formed from concatenation of PrimePi(n) and prime(n).

Terms

a(0) =2a(1) =13a(2) =311a(3) =313a(4) =419a(5) =641a(6) =643a(7) =647a(8) =653a(9) =761a(10) =983a(11) =997a(12) =9103a(13) =11131a(14) =11149a(15) =12157a(16) =12163a(17) =14197a(18) =15227a(19) =15233a(20) =18307a(21) =18311a(22) =18313a(23) =20353a(24) =20359a(25) =21379a(26) =21383a(27) =21397a(28) =22409a(29) =23431