Primes with twelve embedded primes.

Terms

a(0) =113171a(1) =113173a(2) =113797a(3) =123719a(4) =153137a(5) =179719a(6) =199739a(7) =213173a(8) =229373a(9) =231197a(10) =233113a(11) =233713a(12) =236779a(13) =237331a(14) =237619a(15) =237971a(16) =241973a(17) =259397a(18) =317971a(19) =327193a(20) =343373a(21) =353173a(22) =361373a(23) =372719a(24) =373379a(25) =382373a(26) =432713a(27) =519733a(28) =521137a(29) =521317