Primes with digital product = 9.

Terms

a(0) =19a(1) =191a(2) =313a(3) =331a(4) =911a(5) =11119a(6) =111119a(7) =111191a(8) =113131a(9) =131113a(10) =131311a(11) =911111a(12) =1131113a(13) =1131131a(14) =1311131a(15) =1311311a(16) =3111131a(17) =3113111a(18) =11111119a(19) =11111911a(20) =11911111a(21) =111111313a(22) =111111331a(23) =111113113a(24) =111113131a(25) =111131131a(26) =111133111