Primes that are still primes when turned upsided down.

Terms

a(0) =11a(1) =19a(2) =61a(3) =101a(4) =109a(5) =181a(6) =199a(7) =601a(8) =619a(9) =661a(10) =1019a(11) =1061a(12) =1091a(13) =1109a(14) =1181a(15) =1601a(16) =1609a(17) =1669a(18) =1699a(19) =1811a(20) =1901a(21) =1999a(22) =6011a(23) =6091a(24) =6101a(25) =6199a(26) =6619a(27) =6661a(28) =6689a(29) =6691