Primes that contain digits 1 and 8 only.

Terms

a(0) =11a(1) =181a(2) =811a(3) =881a(4) =1181a(5) =1811a(6) =8111a(7) =18181a(8) =81181a(9) =88811a(10) =1111181a(11) =1181881a(12) =1881181a(13) =1881811a(14) =1881881a(15) =8118181a(16) =8181881a(17) =8188111a(18) =8188181a(19) =8818811a(20) =8881111a(21) =8881811a(22) =11818181a(23) =11881811a(24) =11888111a(25) =18111881a(26) =18118811a(27) =18181181a(28) =18811181a(29) =18888811