Composite numbers with digital product = 3.

Terms

a(0) =1113a(1) =1131a(2) =1311a(3) =3111a(4) =13111a(5) =31111a(6) =111113a(7) =111131a(8) =111311a(9) =1111113a(10) =1111131a(11) =1111311a(12) =1113111a(13) =1131111a(14) =1311111a(15) =3111111a(16) =11111113a(17) =11311111a(18) =13111111a(19) =31111111a(20) =111111311a(21) =111131111a(22) =111311111a(23) =113111111a(24) =311111111a(25) =1111111113a(26) =1111111131a(27) =1111111311