Emirps using each of the digits 1, 3, 7, 9 at least once, but no others.

Terms

a(0) =3719a(1) =3917a(2) =7193a(3) =9173a(4) =17393a(5) =17939a(6) =19793a(7) =19973a(8) =31799a(9) =37199a(10) =37991a(11) =39371a(12) =39791a(13) =71399a(14) =79319a(15) =91397a(16) =93971a(17) =99173a(18) =99317a(19) =99713a(20) =113797a(21) =117193a(22) =119773a(23) =131797a(24) =133379a(25) =137993a(26) =139397a(27) =171937a(28) =177319a(29) =179173