Primes having only {1, 7, 8} as digits.

Terms

a(0) =7a(1) =11a(2) =17a(3) =71a(4) =181a(5) =787a(6) =811a(7) =877a(8) =881a(9) =887a(10) =1117a(11) =1171a(12) =1181a(13) =1187a(14) =1777a(15) =1787a(16) =1811a(17) =1871a(18) =1877a(19) =7177a(20) =7187a(21) =7717a(22) =7817a(23) =7877a(24) =8111a(25) =8117a(26) =8171a(27) =8887a(28) =11117a(29) =11171