Primes having only {0, 1, 9} as digits.

Terms

a(0) =11a(1) =19a(2) =101a(3) =109a(4) =191a(5) =199a(6) =911a(7) =919a(8) =991a(9) =1009a(10) =1019a(11) =1091a(12) =1109a(13) =1901a(14) =1999a(15) =9001a(16) =9011a(17) =9091a(18) =9109a(19) =9199a(20) =9901a(21) =10009a(22) =10091a(23) =10099a(24) =10111a(25) =10909a(26) =11119a(27) =11909a(28) =19001a(29) =19009