Primes having only {3, 7, 8} as digits.

Terms

a(0) =3a(1) =7a(2) =37a(3) =73a(4) =83a(5) =337a(6) =373a(7) =383a(8) =733a(9) =773a(10) =787a(11) =877a(12) =883a(13) =887a(14) =3373a(15) =3733a(16) =3833a(17) =3877a(18) =7333a(19) =7873a(20) =7877a(21) =7883a(22) =8377a(23) =8387a(24) =8737a(25) =8783a(26) =8837a(27) =8887a(28) =33377a(29) =33773