Primes having only {1, 4, 8} as digits.

Terms

a(0) =11a(1) =41a(2) =181a(3) =811a(4) =881a(5) =1181a(6) =1481a(7) =1811a(8) =4111a(9) =4441a(10) =4481a(11) =8111a(12) =11411a(13) =14411a(14) =18181a(15) =18481a(16) =41141a(17) =41411a(18) =44111a(19) =48481a(20) =81181a(21) =84181a(22) =84481a(23) =84811a(24) =88411a(25) =88811a(26) =118411a(27) =141181a(28) =141481a(29) =141811