Primes with digital product = 3.

Terms

a(0) =3a(1) =13a(2) =31a(3) =113a(4) =131a(5) =311a(6) =11113a(7) =11131a(8) =11311a(9) =113111a(10) =131111a(11) =311111a(12) =11111131a(13) =11111311a(14) =11113111a(15) =11131111a(16) =111111113a(17) =111111131a(18) =111113111a(19) =131111111a(20) =11111111113a(21) =11111111131a(22) =11113111111a(23) =11131111111a(24) =31111111111