Primes such that the decimal concatenation of prime(n) and n is prime.

Terms

a(0) =5a(1) =23a(2) =67a(3) =73a(4) =157a(5) =307a(6) =389a(7) =419a(8) =449a(9) =587a(10) =661a(11) =751a(12) =1051a(13) =1229a(14) =1297a(15) =1303a(16) =1327a(17) =1823a(18) =1913a(19) =1999a(20) =2131a(21) =2179a(22) =2207a(23) =2239a(24) =2371a(25) =2689a(26) =2699a(27) =3067a(28) =3433a(29) =3593