The least prime that has at least n embedded primes, reading forward and backward.

Terms

a(0) =2a(1) =13a(2) =13a(3) =37a(4) =113a(5) =113a(6) =137a(7) =1237a(8) =1373a(9) =1733a(10) =1733a(11) =11317a(12) =11731a(13) =12713a(14) =19973a(15) =91733a(16) =113173a(17) =113371a(18) =113371a(19) =173347a(20) =991733a(21) =1123379a(22) =1134673a(23) =1137991a(24) =1237199a(25) =2333719a(26) =7433719a(27) =11133719a(28) =11399173a(29) =11399173