Palindromes for which the product of the digits is prime.

Terms

a(0) =2a(1) =3a(2) =5a(3) =7a(4) =121a(5) =131a(6) =151a(7) =171a(8) =11211a(9) =11311a(10) =11511a(11) =11711a(12) =1112111a(13) =1113111a(14) =1115111a(15) =1117111a(16) =111121111a(17) =111131111a(18) =111151111a(19) =111171111a(20) =11111211111a(21) =11111311111a(22) =11111511111a(23) =11111711111