Primes consisting only of digits 3 and 4 occurring with equal frequency.

Terms

a(0) =43a(1) =34434343a(2) =44334343a(3) =44343433a(4) =3334344443a(5) =3343443443a(6) =3344334443a(7) =3344344343a(8) =3344434433a(9) =3433434443a(10) =3433444433a(11) =3434444333a(12) =3443343443a(13) =3444334343a(14) =4334433443a(15) =4334443433a(16) =4343444333a(17) =4344333443a(18) =4344433343a(19) =4344443333a(20) =4433343443a(21) =4433344343a(22) =4434334343