Smallest prime whose product of digits is 3^n.

Terms

a(0) =11a(1) =3a(2) =19a(3) =139a(4) =199a(5) =1399a(6) =1999a(7) =13999a(8) =99991a(9) =139999a(10) =199999a(11) =1399999a(12) =9999991a(13) =19399999a(14) =19999999a(15) =919999939a(16) =1399939999a(17) =1999993999a(18) =9199999999a(19) =19399999999a(20) =99999199999a(21) =199999939999a(22) =991999999999